DateTime class php cause bug in Laravel 5.1?

I used this code in my controller of a project using Laravel 5.1 :

$start_date = "2015-06-10";
$date = new DateTime($start_date);

But always I run code in server both Chrome and Firefox, my web seem to be "dead" in that line, it show the error : 500 Internal server error, and after many debug, I found that bug.

Anyone can give me solution to fix that, thanks :(

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