[otrs] 2.4.2 dashboard does not work after upgrade

As soon as I click the new "dashboard" link :-( Software error: Can't use an undefined value as an ARRAY reference at /opt/otrs//Kernel/System/Ticket/IndexAccelerator/RuntimeDB.pm line 210. For help, please send mail to the webmaster (support@recognia.com), giving this error message and the time and date of the error. ---snip--- [root@mon-one:/opt/otrs]# perl -cw /opt/otrs//Kernel/System/Ticket/IndexAccelerator/RuntimeDB.pm /opt/otrs//Kernel/System/Ticket/IndexAccelerator/RuntimeDB.pm syntax OK -- “Don't eat anything you've ever seen advertised on TV” - Michael Pollan, author of "In Defense of Food"