Fix: free useless timer
diff --git a/lib/nodejs/lib/thrift/connection.js b/lib/nodejs/lib/thrift/connection.js
index 15d955b..9e5c063 100644
--- a/lib/nodejs/lib/thrift/connection.js
+++ b/lib/nodejs/lib/thrift/connection.js
@@ -222,6 +222,7 @@
 
   this.retry_timer = setTimeout(function () {
     if (self.connection.destroyed) {
+      self.retry_timer = null;
       return;
     }