diff --git a/src/controllers/GroupsController.ts b/src/controllers/GroupsController.ts
index 7d92280..99dfd15 100644
--- a/src/controllers/GroupsController.ts
+++ b/src/controllers/GroupsController.ts
@@ -300,7 +300,7 @@ export class GroupsController {
 		const groupID = await h.postGroupIDWithAccess("group_id", GroupsAccessLevel.MODERATOR_ACCESS);
 		const userID = await h.postUserId("userID");
 
-		if(!await GroupsHelper.GetMembershipLevel(groupID, userID))
+		if(await GroupsHelper.GetMembershipLevel(groupID, userID) != GroupMembershipLevels.VISITOR)
 			h.error(401, "The user is not a visitor of the group!");
 		
 		await GroupsHelper.SendInvitation(groupID, userID);