diff --git a/server/server.go b/server/server.go
index 9713355..76212d1 100644
--- a/server/server.go
+++ b/server/server.go
@@ -568,7 +568,7 @@ func (slf *Server) dispatchMessage(msg *Message) {
 				}
 			}()
 			err := handle()
-			if cb {
+			if cb && callback != nil {
 				callback(err)
 			} else {
 				log.Error("Server", log.String("MessageType", messageNames[msg.t]), log.Any("error", err), log.String("stack", string(debug.Stack())))