NULL portal when finishing sanctum

Bug Report Ref: 2,834,965,231

London EU Gateway, no idea if the instance my map was in somehow closed due to some server issue, in which case its probably unavoidable, but figured i'd mention it.

I ran through my saved 8 sanctums, starting from room 1 floor 1. At the end of the 8(9) rooms, its only possible to exit via the portal, which normally brings you back to your map.

My portal is NULL, however. I cannot use it.

On logging out and returning to my hideout, I can confirm the instance had closed. I only spent maybe 10 minutes max inside the sanctum. So I guess the instance just died somehow, RIP.