Whenever I try to create a game of guess who it displays this error in the console;

[ERROR] lua/includes/modules/draw.lua:192: attempt to index local 'color' (a nil value)
1. RoundedBox - lua/includes/modules/draw.lua:192
2. unknown - addons/guesswho-master/gamemodes/guesswho/gamemode/cl_pickteam.lua:83

Has anyone else had this problem or am I the only one getting this? Could there be a problem in my cfg?