diff --git a/core/src/actionscript/org/flowplayer/controller/InStreamTracker.as b/core/src/actionscript/org/flowplayer/controller/InStreamTracker.as
index cdfee19..78e3741 100644
--- a/core/src/actionscript/org/flowplayer/controller/InStreamTracker.as
+++ b/core/src/actionscript/org/flowplayer/controller/InStreamTracker.as
@@ -66,6 +66,7 @@ package org.flowplayer.controller {
                 _timer.stop();
                 _timer.removeEventListener(TimerEvent.TIMER, onTimer);
             }
+            _timer = null;
         }
 
         private function onTimer(event:TimerEvent):void {
@@ -90,4 +91,4 @@ package org.flowplayer.controller {
         }
     }
 
-}
\ No newline at end of file
+}