diff --git a/public/js/components/Stv/Studentenverwaltung/Details/Mobility/List/Purpose.js b/public/js/components/Stv/Studentenverwaltung/Details/Mobility/List/Purpose.js
index 2515b5865..8e2c61f1f 100644
--- a/public/js/components/Stv/Studentenverwaltung/Details/Mobility/List/Purpose.js
+++ b/public/js/components/Stv/Studentenverwaltung/Details/Mobility/List/Purpose.js
@@ -13,7 +13,7 @@ export default {
 	},
 	props: {
 		bisio_id: {
-			type: [Number],
+			type: [Number, null],
 			required: true
 		},
 		listPurposes: {