I am on a server with my friends that im hosting and everytime my friend and I open our inventories or even join the game it crashes. There is a string of text that makes me think it is the funny rat mod.

funy rat log.txt

"Caused by: java.lang.NullPointerException: Cannot load from object array because "ladysnake.ratsmischief.client.render.entity.PartyHatFeatureRenderer.TEXTURES" is null"