November 27, 2020
Sorry to hear that you are having issues! I've just pushed a new version with several added safety checks to catch any unexpected errors and help suggest potential fixes. The most common cause for your particular issue is having multiple accounts signed in at once. This is related to a bug in how Google handles add-on execution so there is little I can do to actually solve the issue. It can easily be fixed by signing out of all but one account, but that is an extra amount of frustration that users don't want to deal with. I'm still looking into good ways to handle this on my end, but for now signing out of all but one account should solve your problems!