Title says it all; the crash log is very clear, and the problem goes away immediately if I set the tameable treasure slime chance percentage to 1 as a compromise.

There's a decent chance the same crash might apply to other numeric inputs.

SANITIZE YOUR INPUTS!

:)

Looks like you need to change the order of the conditions on line 113 of EntityTreasureSlime.java.

Thanks for reporting! Stupid oversight, once more :P Will fix. You can set it to negative for now to get the same effect I suppose.