This problem happen to me in: Showa Street 3 , Showa street 2 (after casting a skill crashed) , Showa street 1.
The class i was in: Demon Slayer
I tried changing channels it didn't help , the time i click attack or cast attacking skill the game crash , i tried and went outside that map and it was fine i can attack and cast with no problem.
I wish anyone test this too to confirm if they crash or not.
Edit: I asked a guildy to go in and try and she crashed she was dragon knight (So the job is not the problem , its the map)
Edit 2: Its Extra B , the time you hit him the game crash.