diff --git a/server/gameserver/roommgr.cc b/server/gameserver/roommgr.cc
index 9782d702..7942aa02 100644
--- a/server/gameserver/roommgr.cc
+++ b/server/gameserver/roommgr.cc
@@ -868,6 +868,10 @@ void RoomMgr::_CMJoinCustomBattle(f8::MsgHdr& hdr, const cs::CMJoin& msg)
                 RoomMgr::Instance()->JoinErrorHandle(*join_msg, 2, socket_handle);
                 return;
             }
+            if (!p->CanAdd(join_msg->account_id(), join_msg->session_id())) {
+                RoomMgr::Instance()->JoinErrorHandle(*join_msg, 2, socket_handle);
+                return;
+            }
         };
     SendGetCustomBattleData(join_msg, cb);
 }