I have been building a BOT to use the browser to Authenticate to Office 365, and there have been several times when the BOT responds with “Cannot read property ‘status’ of null”. If I then run the BOT a second time, this error does not occur. This as happened with Open URL | Wait for Element and Click on Element Activities all pointing to different Web Elements.
I also have discovered, if you do not open Chrome manually I sometimes get the error “Extension is not connected” even though the extension is connected and enabled. I have found manually opening and closing the browser resolves this next time the BOT runs.