Error http 500 internal server error when attempting to create a new ticket

Hi everyone, if someone can give some hand on these i will apreciatte so much! 

PHP Fatal error:  Uncaught exception 'InvalidArgumentException' with message 'List indices should be integers' in C:\\xampp\\htdocs\\support\\include\\class.util.php:149\nStack trace:\n#0 C:\\xampp\\htdocs\\support\\include\\class.forms.php(81): ListObject->offsetExists('message')\n#1 C:\\xampp\\htdocs\\support\\open.php(33): Form->getField('message')\n#2 {main}\n  thrown in :\\xampp\\htdocs\\support\\include\\class.util.php on line 149, referer: http://localhost/support/open.php

Best regards,

Marco Castro