diff --git a/public/js/components/Stv/Studentenverwaltung/Details/Kontakt/Address.js b/public/js/components/Stv/Studentenverwaltung/Details/Kontakt/Address.js
index ed32e2eab..d0c7fbd04 100644
--- a/public/js/components/Stv/Studentenverwaltung/Details/Kontakt/Address.js
+++ b/public/js/components/Stv/Studentenverwaltung/Details/Kontakt/Address.js
@@ -231,7 +231,7 @@ export default{
 			this.reload();
 		},
 		selectedFirma(newVal) {
-			this.addressData.firma_id = newVal?.firma_id || '';
+			this.addressData.firma_id = newVal?.firma_id || null;
 		}
 	},
 	methods:{