diff --git a/apps/infoalloggi/src/components/IconComponents.tsx b/apps/infoalloggi/src/components/IconComponents.tsx
index 9c53345..60911dc 100644
--- a/apps/infoalloggi/src/components/IconComponents.tsx
+++ b/apps/infoalloggi/src/components/IconComponents.tsx
@@ -203,7 +203,7 @@ export const IconMatrix = ({ type, ...rest }: IconMatrixProps) => {
 		case "thumbs-up":
 			return <ThumbsUp {...rest} />;
 		default:
-			return <div>Icon not found</div>;
+			throw new Error(`Invalid icon type: ${type satisfies never}`);
 	}
 };
 
diff --git a/apps/infoalloggi/src/components/custom_ui/fileUpload.tsx b/apps/infoalloggi/src/components/custom_ui/fileUpload.tsx
index 7816ecc..c84e015 100644
--- a/apps/infoalloggi/src/components/custom_ui/fileUpload.tsx
+++ b/apps/infoalloggi/src/components/custom_ui/fileUpload.tsx
@@ -204,7 +204,7 @@ function createStore(
 			}
 
 			default:
-				return state;
+				throw new Error(`Unhandled action type: ${action satisfies never}`);
 		}
 	}
 
@@ -1291,7 +1291,7 @@ function FileUploadItemProgress(props: FileUploadItemProgressProps) {
 			);
 		}
 
-		default:
+		case "linear":
 			return (
 				<ItemProgressPrimitive
 					aria-labelledby={itemContext.nameId}
@@ -1315,6 +1315,8 @@ function FileUploadItemProgress(props: FileUploadItemProgressProps) {
 					/>
 				</ItemProgressPrimitive>
 			);
+		default:
+			throw new Error(`Unknown variant: ${variant satisfies never}`);
 	}
 }
 
diff --git a/apps/infoalloggi/src/components/map/Map.tsx b/apps/infoalloggi/src/components/map/Map.tsx
index 5709264..e8b68de 100644
--- a/apps/infoalloggi/src/components/map/Map.tsx
+++ b/apps/infoalloggi/src/components/map/Map.tsx
@@ -158,6 +158,8 @@ const MapComp = ({
 						</CustomMarker>
 					</>
 				);
+			default:
+				throw new Error(`Invalid marker type: ${markerType satisfies never}`);
 		}
 	};
 
diff --git a/apps/infoalloggi/src/i18n/stripe.ts b/apps/infoalloggi/src/i18n/stripe.ts
index 5018eec..a55d29a 100644
--- a/apps/infoalloggi/src/i18n/stripe.ts
+++ b/apps/infoalloggi/src/i18n/stripe.ts
@@ -148,5 +148,7 @@ export const PaymentMethodToString = (type: PaymentType) => {
 			return "WeChat Pay";
 		case "zip":
 			return "Zip";
+		default:
+			throw new Error(`Invalid payment type: ${type satisfies never}`);
 	}
 };
diff --git a/apps/infoalloggi/src/server/services/mailer.ts b/apps/infoalloggi/src/server/services/mailer.ts
index 6a695a4..cbd746b 100644
--- a/apps/infoalloggi/src/server/services/mailer.ts
+++ b/apps/infoalloggi/src/server/services/mailer.ts
@@ -183,14 +183,10 @@ export const genMail = async ({ ...mail }: MailsTemplates) => {
 			title = "Invito al sito";
 			break;
 		default:
-			mailComponent = null;
-			break;
-	}
-	if (mailComponent === null) {
-		throw new TRPCError({
-			code: "INTERNAL_SERVER_ERROR",
-			message: "Errore nella creazione dell'email",
-		});
+			throw new TRPCError({
+				code: "INTERNAL_SERVER_ERROR",
+				message: `Tipo di email non valido: ${mail satisfies never}`,
+			});
 	}
 
 	return { html: await render(mailComponent), title };