When editing items (e.g. http://head.bibkat.no:8080/cgi-bin/koha/cataloguing/additem.pl?biblionumber=18) clicking on the "Delete" link on the left side of the items table gives this error: Can't call method "fields" on an undefined value at /home/magnus/kohahead/C4/Biblio.pm line 2097. This is because the biblionumber is missing from the link: http://head.bibkat.no:8080/cgi-bin/koha/cataloguing/additem.pl?op=delitem&biblionumber=&itemnumber=4 Clicking on a row to get the little inline menu and then clicking "Delete" there works fine.
Pushed please test
Clicking the "Delete" link on the left side of the items table works fine in current master.