Last modified: 2013-10-23 19:18:15 UTC
Created attachment 11501 [details] Backtrace of the problem Semantic Tasks seems to cause a problem here, though the problem lies somewhere within Semantic MediaWiki according to Jeroen's assment. I have attached the backtrace for further reference.
If the problem still persists with the current master (SMW 1.9+), feel free to re-open this ticket. Furthermore it would of advantage to have a unit test that allows to verify the issue.