Fix notice about undefined index 'visitorid' in libs/chat.php
Fix notice about undefined index 'visitorid' in libs/chat.php

Mibew/java,Mibew/tray,Mibew/tray,Mibew/tray,Mibew/tray,Mibew/tray,Mibew/java,Mibew/java,Mibew/java,Mibew/java,Mibew/java,Mibew/tray