Runtime Deprecated code usage!

Fuel\Core\PhpErrorException [ Runtime Deprecated code usage ]: strstr(): Passing null to parameter #1 ($haystack) of type string is deprecated

COREPATH/classes/input/instance.php @ line 449:

448:	$content_header = \Input::headers('Content-Type');
449:	if (($content_type = strstr($content_header, ';', true)) === false)
450:	{
Notice: Error throttling threshold was reached, no more full error reports are shown. in COREPATH/classes/errorhandler.php [171]: recover FuelPHP Framework