Fatal error: Uncaught Error: Call to a member function query() on null in C:\Apache24\htdocs\soitec\persistencia\HelpDeskDAO.php:204 Stack trace: #0 C:\Apache24\htdocs\soitec\src\frmchathelpdesk.php(20): HelpDeskDAO->listaChat() #1 {main} thrown in C:\Apache24\htdocs\soitec\persistencia\HelpDeskDAO.php on line 204