Build: 7.99.15-pre7
Date: 2/14/2018

Issue:

Resolution: You need to isolate this method from the server with a @SideOnly(Side.CLIENT). This method got called on the server and then crashed when trying to get client class EntityPlayerSP.

Test: I've created this patch and tested locally with success.

yeah that's a easy to fix bug

since you have made and tested these changes localy would you mind making a quick PR? (unless alex/afdw gets to it before)