Crash in Infested Valley Map

I am playing in Delve league. When there is Shaper's Stronghold attribute at Infested Valley, I entered the map. While killing boss, the shaper came and went. Right after I killed boss, the game crashed saying "unexpected error occured".
Right after I entered my hideout to use another portal to enter the map so that I could get loot. But portals are gone. The shaper stronghold is still at the map. By the way, I am using mostly zombies, spectres and golem if this helps you to find the problem.