diff --git a/lib/flashdetect/flashdetect.js b/lib/flashdetect/flashdetect.js
index 672e9b4e939..141d4ab2339 100644
--- a/lib/flashdetect/flashdetect.js
+++ b/lib/flashdetect/flashdetect.js
@@ -5,5 +5,6 @@
 //WARNING: before to use this function you need to load lib/swfobject/swfobject.js + YUI: 'yahoo-min.js', 'event-min.js', 'connection-min.js'
 function setflashversiontosession (wwwroot, sesskey) {
     var flashversion = swfobject.getFlashPlayerVersion();
-    YAHOO.util.Connect.asyncRequest('GET',wwwroot+'/login/environment.php?sesskey='+sesskey+'&flashversion='+flashversion.major+'.'+flashversion.minor+'.'+flashversion.release);
+    var callback = {}; //the callback is mandatory in 2.8.0r4 because there is a bug hen checking xdr attribute
+    YAHOO.util.Connect.asyncRequest('GET',wwwroot+'/login/environment.php?sesskey='+sesskey+'&flashversion='+flashversion.major+'.'+flashversion.minor+'.'+flashversion.release, callback);
 }
\ No newline at end of file