Return of Reckoning

Heya,

I'm not sure what's causing it, wasn't playing for a few days and just got rank 40 , changed some tactics and mastery tree. Since today, each scenario I join I get this http://prnt.sc/c8yeev

"NullReferenceException was thrown from RegisterTacticBuff".

This error I get when I add tactic slots and then SCs are bugged.

Bugs go here.
Just to let you know.

As mentioned by Raziel.