fixes #154

Signed-off-by: Dimitris Xalatsis <dimitris_ha@hotmail.com>

Author: mitsos1os

lib/sender.js

@@ -413,11 +413,12 @@ class FluentSender {
             callbacks.forEach((callback) => {
               this._handleEvent('error', error, callback);
             });
+          } else { // no error on ack
+            callbacks.forEach((callback) => {
+              callback && callback();
+            });
           }
           this._sendQueueSize -= sendPacketSize;
-          callbacks.forEach((callback) => {
-            callback && callback();
-          });
           process.nextTick(() => {
             this._waitToWrite();
           });