There is a simple check for sratch CSS class which fails for nonsense data (aka koji call makeTask 'xyz' (without list)). It will break at least index (while task is in head) and taskinfo page.
PR #2113
Metadata Update from @tkopecek: - Custom field Size adjusted to None
Metadata Update from @jcupova: - Issue tagged with: testing-ready
Metadata Update from @jcupova: - Issue tagged with: testing-done
Commit c64ca5fb fixes this issue
Commit 758f0a03 fixes this issue
This issue has been migrated to Fedora Forge: https://forge.fedoraproject.org/koji/koji/issues/2112
Please continue any further discussion there.