Broken back button for invalid invite token input

[decentral1se]

During invite flow, if you hit /invite/consume and put in an invalid value, then you see:

Error #400 - Bad Request There was a problem with your Request: id (feedRef: couldn't parse "...": ssb: Invalid Ref Back

Then when you click "Back" it gives you a blank HTML page (points to /invite/consume). Clicking back from there on the browser gets you back to /join-manually?token=....

I guess the "Back" button needs to remember the /join-manually/... URL to thread back to it?