Error lies in scripts/skinsutils.lua:342 for _,item_tag in pairs(tags) do if item_tag == tag then return true end end Should be: if tags == nil then return false end for _,item_tag in pairs(tags) do if item_tag == tag then return true end end For a fallback if no tags are found. Alternatively it could be: for _,item_tag in pairs(tags or {}) do if item_tag == tag then return true end end It gets overridden at the line "tags = Prefabs[item].skin_tags".   Alternatively alternatively it could also be changed via: if Prefabs[item] ~= nil then tags = Prefabs[item].skin_tags end To: if Prefabs[item] ~= nil and Prefabs[item].skin_tags then tags = Prefabs[item].skin_tags end   Stack trace:  
Fixed