multi thread issue in phonegap ios and android

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Javascript

PhoneGap

Hi all
Please look at my code here.

function itmerStart()
{
    if (timerId) return
        
        timerId = setInterval(loadMessageListCron, 20000);
    
    function loadMessageListCron()
    {
        var userid = window.localStorage.getItem("userId");
        if(userid != undefined)
        {
            alert("thread calling..");
            $.ajax("http://abc.com/Rest/get_all_messages?UserId="+ userid).done(function(data)
           {
              var i, response;
              $.each(data.messages, function (i, response)
              {
inboxMessageItmerStop();                                                                                         insertMessages(response, i);
inboxMessageItmerStart();
         });
        });
        }
    }
}

I had created this code to handle threads in PhoneGap, but if I run this code I am getting the following error.

"Thread 14 WebCore: Database: EXC_BAD_ACCESS (code = 1, address = Oxbbadbeef)"

I am also using another thread which looks like the one which I had pasted above, suddenly my application crashes and getting the same error message, and I would also like to use the same multi thread code for both android and Ios could someone suggest me a better way to reuse the same code for both android and Ios? So what am I missing in this, could some one suggest a way to fix this error.