diff --git a/database/entity/0044-adapt_users_table_for_gradidoid/User.ts b/database/entity/0044-adapt_users_table_for_gradidoid/User.ts
index 658638b5e..ca6d80cb9 100644
--- a/database/entity/0044-adapt_users_table_for_gradidoid/User.ts
+++ b/database/entity/0044-adapt_users_table_for_gradidoid/User.ts
@@ -8,7 +8,7 @@ export class User extends BaseEntity {
   @Column({
     name: 'gradido_id',
     length: 36,
-    nullable: true,
+    nullable: false,
     default: null,
     collation: 'utf8mb4_unicode_ci',
   })