character cant handle walking by minion

please fix this problem... my game was just completely ruined cus of this... i pressed to walk back and my character just walked into a minion and instead of passing by him or around him or even through him he just walk right and left! took 2 seconds to get over that bug and as you know 2 seconds is well enough time to die! thnx to replay i got recording of that bug or whatever that was...