Object has been disconnected or does not exist at the server.

Hey, I am using photon server sdk and I am lately been seeing a lot of "Object 'some long guid' has been disconnected or does not exist at the server." errors. These are happening in my server code with debugger attached. They seem to be happening randomly and at random locations in the code.

I am not sure how to debug them or what may be causing this. Any suggestions?