diff --git a/server/gameserver/bullet.cc b/server/gameserver/bullet.cc
index a078e26f..7ff2ce45 100644
--- a/server/gameserver/bullet.cc
+++ b/server/gameserver/bullet.cc
@@ -1181,7 +1181,8 @@ bool Bullet::IsClientHook()
     if (!sender.Get()->IsPlayer()) {
         return false;
     }
-    if (sender.Get()->GetNetData()->join_msg->proto_version() > 0 &&
+    if (sender.Get()->GetNetData()->join_msg &&
+        sender.Get()->GetNetData()->join_msg->proto_version() > 0 &&
         sender.Get()->GetNetData()->join_msg->proto_version() < 2023121501) {
         return false;
     } else {