BUG in Input.php

I found in my log the following warning message:

temporary solution:

ERROR - 2016-08-14 00:12:25 --> Severity: Warning --> setcookie() expects parameter 3 to be integer, float given /home/www/html/basicapp/system/core/Input.php 410

1- input.php class inherit MY_input.php
2- copy the method set_cookie ()
3- to force the variable expires (int) $ expires
4- waiting for the correction or corresponding recommendations.

I am using CodeIgniter 3.1.0 + PHP 7.0.8-0ubuntu0.16.04.2



best regards.