Manage bundle -button seems to break after clicking "Show filters" / "Hide filters" -link in /cgi-bin/koha/catalogue/detail.pl holdings-table. To recreate: 1. Set system preference "AlwaysShowHoldingsTableFilters" to "Don't" 2. Find a record with items 2. Click Edit > Edit record 3. Change the 7th position of the leader to "c" OR - Click the Tag editor for the leader - Choose "c-Collection" under "7- Bibliographic level" - Click "Save" 4. Click "Save" 5. Click "Show filters" -link in the holdings-table 5. Click "Manage bundles (0|0)" next to one of the items --> Nothing happens If system preference "AlwaysShowHoldingsTableFilters" is set to "Do" and filters are shown in default, the button breaks after clicking the "Hide filters" -link.