Error right after login

I havn’t used Fibery for quite some time. There were a lot of changes since then, I believe.
Today, when I tried to give it a shot, I see the following error:

Oops, something has gone wrong — please refresh the page. If refresh doesn’t help, throw this text at us in chat:

Cannot use ‘in’ operator to search for ‘q/from’ in 3d731710-0f6f-11e9-a90f-5cdad52323f7

Refresh does not help.