After dropping ores into the crusher, the game suddenly crashed. I play singleplayer, and this was a server crash. The crash report mentions a ticking tile/block entity, which corrupted my world. I was able to use MCedit to remove the crusher. I tried using different insertion methods and different ores, but all resulted in this crash.

Report: https://hastebin.com/dobabekuqi.coffeescript

What can be done about it?

Could you please show your IE config file?

Sure thing:

https://hastebin.com/ulixuceyut.coffeescript

It's modified a bit.

Looks like a broken recipe which causes a division by zero

Or a broken energy consumption config

Yeah and that's what's causing it. You set the energy cost modifier for the crusher too low.

I tried with the default setting and it still crashed - the crash reports are the same.

If you set crusher_energyModifier and crusher_timeModifier back to 1, you should see this bug fixed.