Looks like it was an update that went wrong.
After deleting /share/html/Callbacks the wrong callbacks won’t be called anymore and everything works now as expected.-----Ursprüngliche Nachricht-----
Von: email@example.com [mailto:firstname.lastname@example.org] Im Auftrag von Patrick Busch
Gesendet: Donnerstag, 28. August 2008 09:03
Betreff: [rt-users] Ticket History Problem
I installed RT-3.8.1rc5 with RTFM 2.4.0rc1 and RTIR 2.4.0rc1.
Whenever I want to view the ticket history, I get the message
Can’t call method “TicketObj” on an undefined value at /opt/rt3/share/html/Callbacks/RTIR/Ticket/Elements/ShowMessageHeaders/Default line 2.
I get the same message when viewing an incident.
There is no information in the logs that could help me, perhaps someone here knows the answer that I need.
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