Fix reconnect abort logic on client.destroy()

lib/client/client.js

@@ -940,9 +940,11 @@ Client.prototype._connect = function _connect() {
   }
   this.connecting = true;
   retry.start();
-  // Abbord reconnection attemps if client is destroyed
+  // Abort reconnection attempts if client is destroyed
   this.on('destroy', function () {
-    retry.abort();
+    if (retry.isRunning()) {
+      retry.abort();
+    }
   });
 };