diff --git a/apps/infoalloggi/src/forms/FormBanlist.tsx b/apps/infoalloggi/src/forms/FormBanlist.tsx
index 26b6437..8e6f91d 100644
--- a/apps/infoalloggi/src/forms/FormBanlist.tsx
+++ b/apps/infoalloggi/src/forms/FormBanlist.tsx
@@ -118,7 +118,7 @@ export const FormBanlist = ({
 										placeholder=""
 										{...field}
 										id="testo"
-										value={field.value || ""}
+										value={field.value}
 									/>
 								</FormControl>
 							</FormItem>
diff --git a/apps/infoalloggi/src/forms/FormBanners.tsx b/apps/infoalloggi/src/forms/FormBanners.tsx
index 750c0b6..d2f78f9 100644
--- a/apps/infoalloggi/src/forms/FormBanners.tsx
+++ b/apps/infoalloggi/src/forms/FormBanners.tsx
@@ -18,6 +18,7 @@ import {
 	SelectValue,
 } from "~/components/ui/select";
 import { Switch } from "~/components/ui/switch";
+import { NullableStringOnChange } from "~/lib/form_utils";
 import { useZodForm } from "~/lib/zodForm";
 import type { Banners, BannersIdbanner } from "~/schemas/public/Banners";
 
@@ -123,6 +124,7 @@ export const FormBanners = ({
 										placeholder=""
 										{...field}
 										id="titolo"
+										onChange={(e) => NullableStringOnChange(e, field.onChange)}
 										value={field.value || ""}
 									/>
 								</FormControl>
@@ -143,6 +145,7 @@ export const FormBanners = ({
 										placeholder=""
 										{...field}
 										id="testo"
+										onChange={(e) => NullableStringOnChange(e, field.onChange)}
 										value={field.value || ""}
 									/>
 								</FormControl>
@@ -229,6 +232,7 @@ export const FormBanners = ({
 										placeholder=""
 										{...field}
 										id="cta_href"
+										onChange={(e) => NullableStringOnChange(e, field.onChange)}
 										value={field.value || ""}
 									/>
 								</FormControl>
@@ -251,6 +255,7 @@ export const FormBanners = ({
 										placeholder=""
 										{...field}
 										id="cta_icon"
+										onChange={(e) => NullableStringOnChange(e, field.onChange)}
 										value={field.value || ""}
 									/>
 								</FormControl>
@@ -271,6 +276,7 @@ export const FormBanners = ({
 										placeholder=""
 										{...field}
 										id="cta_text"
+										onChange={(e) => NullableStringOnChange(e, field.onChange)}
 										value={field.value || ""}
 									/>
 								</FormControl>
diff --git a/apps/infoalloggi/src/forms/FormEditAnnuncio.tsx b/apps/infoalloggi/src/forms/FormEditAnnuncio.tsx
index 8bf08d3..65e518d 100644
--- a/apps/infoalloggi/src/forms/FormEditAnnuncio.tsx
+++ b/apps/infoalloggi/src/forms/FormEditAnnuncio.tsx
@@ -42,6 +42,7 @@ import {
 import { Switch } from "~/components/ui/switch";
 import { Tabs, TabsContent, TabsList, TabsTrigger } from "~/components/ui/tabs";
 import { filteredCaratteristiche } from "~/hooks/schedaAnnuncioUtils";
+import { NullableStringOnChange } from "~/lib/form_utils";
 import { cn } from "~/lib/utils";
 import { useZodForm } from "~/lib/zodForm";
 import { StatusBadge } from "~/pages/area-riservata/admin/edit-annuncio/[id]";
@@ -69,7 +70,7 @@ export const AnnuncioEditForm = ({ data }: { data: AnnunciWithMedia }) => {
 		desc_en: z.string().nullable(),
 		desc_it: z.string().nullable(),
 		disponibile_da: z.date().nullable(),
-		email: z.email().optional(),
+		email: z.email().nullable(),
 		homepage: z.boolean().nullable(),
 		//BASE
 		id: zAnnuncioId,
@@ -162,7 +163,6 @@ export const AnnuncioEditForm = ({ data }: { data: AnnunciWithMedia }) => {
 	const defaultValues: FormValues = {
 		...data,
 		mq: Number(data.mq) || null,
-		email: data.email || undefined,
 	};
 
 	z.config(z.locales[locale]());
@@ -174,7 +174,7 @@ export const AnnuncioEditForm = ({ data }: { data: AnnunciWithMedia }) => {
 	function onSubmit(fields: FormValues) {
 		edit({
 			annuncioId: data.id,
-			data: { ...fields, email: fields.email || null },
+			data: fields,
 		});
 	}
 
@@ -328,7 +328,13 @@ export const AnnuncioEditForm = ({ data }: { data: AnnunciWithMedia }) => {
 																					placeholder=""
 																					{...field}
 																					id="titolo_it"
-																					value={field.value || undefined}
+																					onChange={(e) =>
+																						NullableStringOnChange(
+																							e,
+																							field.onChange,
+																						)
+																					}
+																					value={field.value || ""}
 																				/>
 																			</FormControl>
 																		</FormItem>
@@ -354,7 +360,13 @@ export const AnnuncioEditForm = ({ data }: { data: AnnunciWithMedia }) => {
 																					placeholder=""
 																					{...field}
 																					id="desc_it"
-																					value={field.value || undefined}
+																					onChange={(e) =>
+																						NullableStringOnChange(
+																							e,
+																							field.onChange,
+																						)
+																					}
+																					value={field.value || ""}
 																				/>
 																			</FormControl>
 																		</FormItem>
@@ -390,7 +402,13 @@ export const AnnuncioEditForm = ({ data }: { data: AnnunciWithMedia }) => {
 																					placeholder=""
 																					{...field}
 																					id="titolo_en"
-																					value={field.value || undefined}
+																					onChange={(e) =>
+																						NullableStringOnChange(
+																							e,
+																							field.onChange,
+																						)
+																					}
+																					value={field.value || ""}
 																				/>
 																			</FormControl>
 																		</FormItem>
@@ -416,7 +434,13 @@ export const AnnuncioEditForm = ({ data }: { data: AnnunciWithMedia }) => {
 																					placeholder=""
 																					{...field}
 																					id="desc_en"
-																					value={field.value || undefined}
+																					onChange={(e) =>
+																						NullableStringOnChange(
+																							e,
+																							field.onChange,
+																						)
+																					}
+																					value={field.value || ""}
 																				/>
 																			</FormControl>
 																		</FormItem>
@@ -549,9 +573,9 @@ export const AnnuncioEditForm = ({ data }: { data: AnnunciWithMedia }) => {
 													{...field}
 													id="locatore"
 													onChange={(e) =>
-														field.onChange(e.target.value || null)
+														NullableStringOnChange(e, field.onChange)
 													}
-													value={field.value || undefined}
+													value={field.value || ""}
 												/>
 											</FormControl>
 										</FormItem>
@@ -573,15 +597,12 @@ export const AnnuncioEditForm = ({ data }: { data: AnnunciWithMedia }) => {
 														<Input
 															placeholder="esempio@email.com"
 															{...field}
+															autoComplete="off"
 															id="email"
 															onChange={(e) =>
-																field.onChange(
-																	e.target.value && e.target.value !== ""
-																		? e.target.value
-																		: null,
-																)
+																NullableStringOnChange(e, field.onChange)
 															}
-															value={field.value || undefined}
+															value={field.value || ""}
 														/>
 													</FormControl>
 												</FormItem>
@@ -641,7 +662,10 @@ export const AnnuncioEditForm = ({ data }: { data: AnnunciWithMedia }) => {
 															placeholder=""
 															{...field}
 															id="indirizzo"
-															value={field.value || undefined}
+															onChange={(e) =>
+																NullableStringOnChange(e, field.onChange)
+															}
+															value={field.value || ""}
 														/>
 													</FormControl>
 												</FormItem>
@@ -664,7 +688,10 @@ export const AnnuncioEditForm = ({ data }: { data: AnnunciWithMedia }) => {
 															placeholder=""
 															{...field}
 															id="civico"
-															value={field.value || undefined}
+															onChange={(e) =>
+																NullableStringOnChange(e, field.onChange)
+															}
+															value={field.value || ""}
 														/>
 													</FormControl>
 												</FormItem>
@@ -689,7 +716,10 @@ export const AnnuncioEditForm = ({ data }: { data: AnnunciWithMedia }) => {
 															placeholder=""
 															{...field}
 															id="comune"
-															value={field.value || undefined}
+															onChange={(e) =>
+																NullableStringOnChange(e, field.onChange)
+															}
+															value={field.value || ""}
 														/>
 													</FormControl>
 												</FormItem>
@@ -712,7 +742,10 @@ export const AnnuncioEditForm = ({ data }: { data: AnnunciWithMedia }) => {
 															placeholder=""
 															{...field}
 															id="cap"
-															value={field.value || undefined}
+															onChange={(e) =>
+																NullableStringOnChange(e, field.onChange)
+															}
+															value={field.value || ""}
 														/>
 													</FormControl>
 												</FormItem>
@@ -737,7 +770,10 @@ export const AnnuncioEditForm = ({ data }: { data: AnnunciWithMedia }) => {
 															placeholder=""
 															{...field}
 															id="provincia"
-															value={field.value || undefined}
+															onChange={(e) =>
+																NullableStringOnChange(e, field.onChange)
+															}
+															value={field.value || ""}
 														/>
 													</FormControl>
 												</FormItem>
@@ -760,7 +796,10 @@ export const AnnuncioEditForm = ({ data }: { data: AnnunciWithMedia }) => {
 															placeholder=""
 															{...field}
 															id="regione"
-															value={field.value || undefined}
+															onChange={(e) =>
+																NullableStringOnChange(e, field.onChange)
+															}
+															value={field.value || ""}
 														/>
 													</FormControl>
 												</FormItem>
@@ -785,7 +824,10 @@ export const AnnuncioEditForm = ({ data }: { data: AnnunciWithMedia }) => {
 															placeholder=""
 															{...field}
 															id="lat"
-															value={field.value || undefined}
+															onChange={(e) =>
+																NullableStringOnChange(e, field.onChange)
+															}
+															value={field.value || ""}
 														/>
 													</FormControl>
 												</FormItem>
@@ -808,7 +850,10 @@ export const AnnuncioEditForm = ({ data }: { data: AnnunciWithMedia }) => {
 															placeholder=""
 															{...field}
 															id="lon"
-															value={field.value || undefined}
+															onChange={(e) =>
+																NullableStringOnChange(e, field.onChange)
+															}
+															value={field.value || ""}
 														/>
 													</FormControl>
 												</FormItem>
@@ -844,7 +889,10 @@ export const AnnuncioEditForm = ({ data }: { data: AnnunciWithMedia }) => {
 															placeholder=""
 															{...field}
 															id="indirizzo_secondario"
-															value={field.value || undefined}
+															onChange={(e) =>
+																NullableStringOnChange(e, field.onChange)
+															}
+															value={field.value || ""}
 														/>
 													</FormControl>
 												</FormItem>
@@ -869,7 +917,10 @@ export const AnnuncioEditForm = ({ data }: { data: AnnunciWithMedia }) => {
 															placeholder=""
 															{...field}
 															id="civico_secondario"
-															value={field.value || undefined}
+															onChange={(e) =>
+																NullableStringOnChange(e, field.onChange)
+															}
+															value={field.value || ""}
 														/>
 													</FormControl>
 												</FormItem>
@@ -896,7 +947,10 @@ export const AnnuncioEditForm = ({ data }: { data: AnnunciWithMedia }) => {
 															placeholder=""
 															{...field}
 															id="lat_secondario"
-															value={field.value || undefined}
+															onChange={(e) =>
+																NullableStringOnChange(e, field.onChange)
+															}
+															value={field.value || ""}
 														/>
 													</FormControl>
 												</FormItem>
@@ -921,7 +975,10 @@ export const AnnuncioEditForm = ({ data }: { data: AnnunciWithMedia }) => {
 															placeholder=""
 															{...field}
 															id="lon_secondario"
-															value={field.value || undefined}
+															onChange={(e) =>
+																NullableStringOnChange(e, field.onChange)
+															}
+															value={field.value || ""}
 														/>
 													</FormControl>
 												</FormItem>
@@ -988,13 +1045,13 @@ export const AnnuncioEditForm = ({ data }: { data: AnnunciWithMedia }) => {
 											render={({ field }) => (
 												<FormItem>
 													<div className="flex flex-wrap items-center gap-x-2">
-														<FormLabel htmlFor="categorie">Categorie</FormLabel>
+														<span className="font-medium text-sm leading-none">
+															Categorie
+														</span>
 														<FormMessage />
 													</div>
 
-													<p className="h-[42px]" id="categorie">
-														{field.value?.join(", ")}
-													</p>
+													<p className="h-[42px]">{field.value?.join(", ")}</p>
 												</FormItem>
 											)}
 										/>
@@ -1235,11 +1292,9 @@ export const AnnuncioEditForm = ({ data }: { data: AnnunciWithMedia }) => {
 														{...field}
 														id="anno"
 														onChange={(e) =>
-															field.onChange(
-																e.target.value !== "" ? e.target.value : null,
-															)
+															NullableStringOnChange(e, field.onChange)
 														}
-														value={field.value || undefined}
+														value={field.value || ""}
 													/>
 												</FormControl>
 											</FormItem>
@@ -1262,11 +1317,9 @@ export const AnnuncioEditForm = ({ data }: { data: AnnunciWithMedia }) => {
 														{...field}
 														id="classe"
 														onChange={(e) =>
-															field.onChange(
-																e.target.value !== "" ? e.target.value : null,
-															)
+															NullableStringOnChange(e, field.onChange)
 														}
-														value={field.value || undefined}
+														value={field.value || ""}
 													/>
 												</FormControl>
 											</FormItem>
@@ -1322,11 +1375,9 @@ export const AnnuncioEditForm = ({ data }: { data: AnnunciWithMedia }) => {
 														{...field}
 														id="piano"
 														onChange={(e) =>
-															field.onChange(
-																e.target.value !== "" ? e.target.value : null,
-															)
+															NullableStringOnChange(e, field.onChange)
 														}
-														value={field.value || undefined}
+														value={field.value || ""}
 													/>
 												</FormControl>
 											</FormItem>
@@ -1748,14 +1799,14 @@ export const AnnuncioEditForm = ({ data }: { data: AnnunciWithMedia }) => {
 									render={({ field }) => (
 										<FormItem>
 											<div className="flex flex-wrap items-center gap-x-2">
-												<FormLabel htmlFor="accessori">Accessori</FormLabel>
+												<span className="font-medium text-sm leading-none">
+													Accessori
+												</span>
 												<FormMessage />
 											</div>
 
 											<FormControl>
-												<p className="h-[42px]" id="accessori">
-													{field.value?.join(", ")}
-												</p>
+												<p className="h-[42px]">{field.value?.join(", ")}</p>
 											</FormControl>
 										</FormItem>
 									)}
@@ -1766,14 +1817,15 @@ export const AnnuncioEditForm = ({ data }: { data: AnnunciWithMedia }) => {
 									render={({ field }) => (
 										<FormItem>
 											<div className="flex flex-wrap items-center gap-x-2">
-												<FormLabel htmlFor="caratteristiche">
+												<span className="font-medium text-sm leading-none">
 													Caratteristiche
-												</FormLabel>
+												</span>
+
 												<FormMessage />
 											</div>
 
 											<FormControl>
-												<p className="h-[42px]" id="caratteristiche">
+												<p className="h-[42px]">
 													{field.value
 														? filteredCaratteristiche(field.value)
 																.map((v) => v.text)
diff --git a/apps/infoalloggi/src/forms/FormEtichette.tsx b/apps/infoalloggi/src/forms/FormEtichette.tsx
index 152b914..1dcf671 100644
--- a/apps/infoalloggi/src/forms/FormEtichette.tsx
+++ b/apps/infoalloggi/src/forms/FormEtichette.tsx
@@ -86,7 +86,7 @@ export const FormEtichette = ({
 										placeholder=""
 										{...field}
 										id="value"
-										value={field.value || ""}
+										value={field.value}
 									/>
 								</FormControl>
 							</FormItem>
diff --git a/apps/infoalloggi/src/forms/FormNewServizioAcquisto.tsx b/apps/infoalloggi/src/forms/FormNewServizioAcquisto.tsx
index f0f81e3..7dfc615 100644
--- a/apps/infoalloggi/src/forms/FormNewServizioAcquisto.tsx
+++ b/apps/infoalloggi/src/forms/FormNewServizioAcquisto.tsx
@@ -51,7 +51,10 @@ import {
 	parseDBComune,
 	parseDBNazione,
 } from "~/lib/catasto";
-import { checkFiscalCodeValidity } from "~/lib/form_utils";
+import {
+	checkFiscalCodeValidity,
+	NullableStringOnChange,
+} from "~/lib/form_utils";
 import { cn } from "~/lib/utils";
 import { useZodForm } from "~/lib/zodForm";
 import { useCatasto } from "~/providers/CatastoProvider";
@@ -1157,13 +1160,14 @@ export const FormNewServizioAcquisto = ({
 												<Input
 													{...field}
 													id="luogoNascita"
-													onChange={async (v) => {
-														field.onChange(v.target.value);
+													onChange={async (e) => {
+														NullableStringOnChange(e, field.onChange);
+
 														await form.trigger("luogo_nascita");
 														await form.trigger("codice_fiscale");
 													}}
 													type="text"
-													value={field.value || undefined}
+													value={field.value || ""}
 												/>
 											</FormControl>
 										</FormItem>
@@ -1409,8 +1413,9 @@ const AziendaSection = ({
 								<Input
 									{...field}
 									id="ragione_sociale"
+									onChange={(e) => NullableStringOnChange(e, field.onChange)}
 									type="text"
-									value={field.value || undefined}
+									value={field.value || ""}
 								/>
 							</FormControl>
 						</FormItem>
@@ -1431,8 +1436,9 @@ const AziendaSection = ({
 								<Input
 									{...field}
 									id="sede_legale"
+									onChange={(e) => NullableStringOnChange(e, field.onChange)}
 									type="text"
-									value={field.value || undefined}
+									value={field.value || ""}
 								/>
 							</FormControl>
 						</FormItem>
@@ -1459,8 +1465,9 @@ const AziendaSection = ({
 								<Input
 									{...field}
 									id="p_iva"
+									onChange={(e) => NullableStringOnChange(e, field.onChange)}
 									type="text"
-									value={field.value || undefined}
+									value={field.value || ""}
 								/>
 							</FormControl>
 						</FormItem>
@@ -1481,8 +1488,9 @@ const AziendaSection = ({
 								<Input
 									{...field}
 									id="legale_rappresentante"
+									onChange={(e) => NullableStringOnChange(e, field.onChange)}
 									type="text"
-									value={field.value || undefined}
+									value={field.value || ""}
 								/>
 							</FormControl>
 						</FormItem>
@@ -1551,8 +1559,9 @@ const FatturazioneSection = ({
 						<Input
 							{...field}
 							id="codice_destinatario"
+							onChange={(e) => NullableStringOnChange(e, field.onChange)}
 							type="text"
-							value={field.value || undefined}
+							value={field.value || ""}
 						/>
 					</FormControl>
 				</FormItem>
@@ -1680,8 +1689,11 @@ const ResidenzaSection = ({
 										<Input
 											{...field}
 											id="provinciaRecapiti"
+											onChange={(e) =>
+												NullableStringOnChange(e, field.onChange)
+											}
 											type="text"
-											value={field.value || undefined}
+											value={field.value || ""}
 										/>
 									</FormControl>
 								)}
@@ -1754,12 +1766,12 @@ const ResidenzaSection = ({
 									<Input
 										{...field}
 										id="citta_recapiti"
-										onChange={async (v) => {
-											field.onChange(v.target.value);
+										onChange={async (e) => {
+											NullableStringOnChange(e, field.onChange);
 											await trigger("citta_recapiti");
 										}}
 										type="text"
-										value={field.value || undefined}
+										value={field.value || ""}
 									/>
 								</FormControl>
 							</FormItem>
diff --git a/apps/infoalloggi/src/forms/FormProfilo_Anagrafica.tsx b/apps/infoalloggi/src/forms/FormProfilo_Anagrafica.tsx
index e1b9ca8..3bfe5f2 100644
--- a/apps/infoalloggi/src/forms/FormProfilo_Anagrafica.tsx
+++ b/apps/infoalloggi/src/forms/FormProfilo_Anagrafica.tsx
@@ -29,7 +29,10 @@ import {
 	parseDBComune,
 	parseDBNazione,
 } from "~/lib/catasto";
-import { checkFiscalCodeValidity } from "~/lib/form_utils";
+import {
+	checkFiscalCodeValidity,
+	NullableStringOnChange,
+} from "~/lib/form_utils";
 import { cn } from "~/lib/utils";
 import { useZodForm } from "~/lib/zodForm";
 import { useCatasto } from "~/providers/CatastoProvider";
@@ -397,8 +400,9 @@ export const ProfileFormAnagrafica = ({
 											<Input
 												{...field}
 												id="luogoNascita"
-												onChange={async (v) => {
-													field.onChange(v.target.value);
+												onChange={async (e) => {
+													NullableStringOnChange(e, field.onChange);
+
 													await form.trigger("luogo_nascita");
 													await form.trigger("codice_fiscale");
 												}}
diff --git a/apps/infoalloggi/src/lib/form_utils.ts b/apps/infoalloggi/src/lib/form_utils.ts
index e0b98b0..1f2d2a8 100644
--- a/apps/infoalloggi/src/lib/form_utils.ts
+++ b/apps/infoalloggi/src/lib/form_utils.ts
@@ -1,10 +1,19 @@
 import dynamic from "next/dynamic";
+import type { ChangeEvent } from "react";
 import type { z } from "zod/v4";
 import type { ListOption } from "~/components/custom_ui/multiselect";
 import type { Comuni } from "~/schemas/public/Comuni";
 import type { Nazioni } from "~/schemas/public/Nazioni";
 import { ITALY_CATASTO_CODE } from "./catasto";
 
+export const NullableStringOnChange = (
+	e: ChangeEvent<HTMLInputElement | HTMLTextAreaElement>,
+	// biome-ignore lint/suspicious/noExplicitAny: <intended>
+	fn: (...event: any[]) => void,
+) => {
+	fn(e.target.value && e.target.value !== "" ? e.target.value : null);
+};
+
 export const FormDebug: React.ElementType =
 	process.env.NODE_ENV === "development"
 		? dynamic(