Client Crash (reproducable, probably) In Act 6 Chamber of Sins

After defeating Maligaro in map device in chamber of sins and obtaining the key from Silk, a player can place a town portal on the stairs leading to Chamber of Sins 2 (covered by purple field until the key is acquired) and a party member who has not yet turned in their poison to Silk (ie has no key) taking that portal will crash.

portal location screenshot (delve supporter portal I think):


In my gameplay, my friend crashed repeatedly on taking my portal until he got the key from Silk.