[Observium] Can't write new info to Observium

Hello all,

never happened to me before, but Obsevium acts strangely lately for me. When trying to add a new device via web, it sucessfully adds it, but it's page appears to be missing. It says something like 'You entered a device which does not exist' or something similar.

What is more, when I want to manually change device's description on the web, it says 'Device record updated'. But the info that I've written has not appeared. What could have caused this? I don't remember doing any changes to my Observium server, except doing an update. Version 17.2.8364 (stable)

Everything else works as it should.

Thank you