Minecraft 1.18.1
Fabric 0.12.12
Iceberg 1.0.35 - 1.0.37

• many other mods

Tooltip conflicts persisting through Iceberg 1.0.37. Rolling back to Iceberg 1.0.27 fixes the issue for me.

crash-2022-01-07_09.56.57-client.txt

The crash happens when a player mouseovers a Mana Tablet from Botania.

The Mana Tablet and several other items in Botania add a mana bar to the item tooltip. This did not conflict with Iceberg 1.0.27. This image was taken with Iceberg 1.0.27 and Legendary Tooltips 1.1.5

Thank you for the report, the log and screenshot were very helpful in tracking this down. This has now been fixed in the most recent release (1.0.38). Feel free to reopen if you have issues with that version.