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doXPath() problem + possible serverProcessor-URL-problem

When my dataprocessor calls my local server's update.php, there is a "&=undefined" at the end:

http://127.0.0.1/pl2test/update.php?tr_id=db&tr_pid=horror&tr_order=2&tr_text=Dan%20Brown&=undefined

maybe that is causing the following problem (generated by Firebug):

docObj has no properties
doXPath("//data/action", null)dhtmlxcommon.js (line 469)
afterUpdate(Object serverProcessor=update.php obj=Object, null, null, null, Object xmlDoc=XMLHttpRequest async=true
mainObject=Object)dhtmlxdataprocess... (line 326)
check()dhtmlxcommon.js (line 41)
[Break on this error] if(docObj.nodeName.indexOf("document")!=-1){

the "&=undefined " text in url line doesn't break anything , it may appear if you have empty userdata ( the userdata records related to tree item included in url )
    <item><userdata />
or
    tree.setUserData("db","",some_undefined)


>>docObj has no properties
>>doXPath("//data/action", null)dhtmlxcommon.js (line 469)

Such error occurs when your server returns incorrect response on dataProcessor action, you can check response - which may contain some details about server response by firebug, or just enable debug output by
    dataProc.enableDebug(true);
   

Oh yes, of course! Thanks