diff --git a/server/wsproxy/longsessionmgr.cc b/server/wsproxy/longsessionmgr.cc
index 77b8c13..f7b9b55 100644
--- a/server/wsproxy/longsessionmgr.cc
+++ b/server/wsproxy/longsessionmgr.cc
@@ -92,7 +92,12 @@ void LongSessionMgr::ProcUdpPacket(a8::UdpPacket* pkt)
 void LongSessionMgr::DelSession(int socket_handle)
 {
     {
-        auto sesion = GetSession(socket_handle);
+        auto session = GetSession(socket_handle);
+        if (session && session.use_count() != 1) {
+#ifdef DEBUG
+            abort();
+#endif
+        }
     }
     socket_handle_hash_.erase(socket_handle);
 }