Thanks eagle and tnemec, got it!
The error appears when there is no /etc/enigma2/movietags file (supposed to contain the tags to fill the tag menu in the dialog with). There is a simple fix, that I will commit tomorrow together with some other small things. If there are no tags defined the menu will be empty, but it should not crash.
(Well, if you cant wait, jast change line 320 of timer.js to:
Code
addTimerEditFormArray.tagsList = (typeof(result.getStateText()) != 'undefined' ? result.getStateText().split(" ") : []);
)
Best Regards
Anders Holst