Why Sometime The Ajax Request Respond Internal Server Error

As I already mentioned in title sometime the ajax request respond internal server error. I am working on an application i which a send a lot of ajax requests, some requests are sent after regular interval of time by using setInterval and setTimeout functions. On the other hand, some requests depend upon the user actions.

I am very confused sometime the ajax request give server error but why? If it was a syntax error it should give this error every time. Here is one of the the code of the ajax request from my requests

@if(Auth::check())
    updateLastActivity();
   @endif

    function updateLastActivity(){
         $.ajax({
            headers: { 'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content') },
            url:'',
            type:'get',
            success:function(data,status){},

                complete:function(data){
             setTimeout(updateLastActivity,5000);
         }


                });
    }

How to resolve that issue.

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