diff --git a/aleksis/apps/lesrooster/frontend/components/timetable_management/TimetableManagement.vue b/aleksis/apps/lesrooster/frontend/components/timetable_management/TimetableManagement.vue
index 5230d19e5bfba5f1c18b2a9d5e5f7d0496433eb3..9e3f70f1db7a171675f22c97bfb9ce5117e525d0 100644
--- a/aleksis/apps/lesrooster/frontend/components/timetable_management/TimetableManagement.vue
+++ b/aleksis/apps/lesrooster/frontend/components/timetable_management/TimetableManagement.vue
@@ -63,7 +63,7 @@ export default defineComponent({
       selectedObjectType: null,
       selectedObjectTitle: "",
       selectedObjectDialogOpen: false,
-      selectedObjectDialogTab: null,
+      selectedObjectDialogTab: 0,
       timeGrids: [],
       groups: [],
       selectedGroup: null,