This game is terrible. You crush PVE opponents until the 17+ stages and then you can't progress unless you got lucky on early card draws. So then you're forced to grind easy level tournaments at a rate of 3 coins per battle or take a gamble on a hard tournament with 80 coins for a potential even return. If you're unlucky you get set back 30-50 coins. All so you can spend 100 coins and roll another RNG and hope you build up enough cards to then progress in the PVE high enough to unlock the other functions. Game is unplayable.
So a zombie in the military base dropped an "undefined" and now I have an item called "undefined" with "undefined" weight in each section of the inventory. Weird right? Best part though is that my weight limit is now NaN/170 and I can pick up everything. :)