UltraRepair's API has now been upgraded to 1.13 to support items that were added after Minecraft 1.8.8 (eg. Tridents)!
Legacy versions should still work. Report any issues here:
https://github.com/Demeng7215/UltraRepair/issues/1 (or use the Discussions section or PM me)
Thank you
@Celebrimbor for reporting the issue!