If a document is opened and the access is revoke in Google account. It throw "Uncaught Error: Authentication error: No token set" endlessly if the Collaborative String is edited.

[Xelio]

I have a similar case when developing an app. How could I catch this error?

[rakyll]

It's thrown from the gapi.drive.realtime.getToken which is also called from gapi.drive.realtime.load. Catch exceptions thrown by these functions.