I was just breaking some dirt with an excavator from tinkers constructor all fine then it crashed
Crash report: https://pastebin.com/hay9THvW
Version: RealisticItemDrops-1.2.11

Oops I think I just derped now that I read the report it seems it's on swing through grass mod not this one, sorry!

That's an interesting oversight. I wonder what the code is doing to consider everything an EntityLivingBase type. I wonder if other entities like minecarts would do this