diff --git a/src/models/creation/CreateUser.ts b/src/models/creation/CreateUser.ts
index 9595039..b024e4c 100644
--- a/src/models/creation/CreateUser.ts
+++ b/src/models/creation/CreateUser.ts
@@ -37,20 +37,19 @@ export class CreateUser {
         }
 
         if (this.groupId) {
-            if (Array.isArray(this.groupId)) {
-                let found_groups = []
-                this.groupId.forEach(async (g) => {
-                    const foundGroup = await getConnectionManager().get().getRepository(UserGroup).find({ id: g });
-                    if (foundGroup) {
-                        found_groups.push(foundGroup)
-                    } else {
-                        throw new UserGroupNotFoundError();
-                    }
-                });
-                newUser.groups = found_groups
-            } else {
-                newUser.groups = await getConnectionManager().get().getRepository(UserGroup).find({ id: this.groupId });
+            if (!Array.isArray(this.groupId)) {
+                this.groupId = [this.groupId]
             }
+            let found_groups = []
+            this.groupId.forEach(async (g) => {
+                const foundGroup = await getConnectionManager().get().getRepository(UserGroup).find({ id: g });
+                if (foundGroup) {
+                    found_groups.push(foundGroup)
+                } else {
+                    throw new UserGroupNotFoundError();
+                }
+            });
+            newUser.groups = found_groups
         }
 
         const new_uuid = uuid.v4()