null entity in worldimpl

[NoSanityHere]

I was trying to use this plugin, but it didnt work, and gave an error in the logs. When i looked for the error, it came down to what seems to be a bug in the WorldImpl class, on line 1211, where a null entity is given, resulting in an attempt to perform the isDescending() function on a null entity on line 40 of the EntityShapeContext class (net/minecraft/block). I can't work out what this is meant to be, there doesn't seem to be an entity to use

[NoSanityHere]

I have now sort of fixed it on a local copy with a mixin (will provide code if requested) but it results in endless recursion