Crash report: https://pastebin.com/GBV6Ga3F
Forge Version: 10.13.4.1614
Skin Port: 1.7.10-v8c
ArmourerWorkShop: 1.7.10-0.48.2

Also it seem this crash happen when you have Skin Port mod installed with ArmourerWorkShop i had tested with just these mods and how to reduce the crash is you install both of these mods i mention and
open the menu (p) then Color Settings the first Auto button