Mastermind's lair crash

I opened it with Jun as usual, but when I click portal, I get the loading screen for a while then get disconnected.

The error message is : Disconnected. Failed to connect to instance.

Bug 291386606

Edit : I opened another map, I can't join instance. Now I can't play at all...

I switched atlas tree and threw in a white map with no mods, everything seems okay now.