Thanks for your reply. As I tried to explain in the description, unfollowing 'urbanrivals' did restore gwibbers normal behaviour. When I then tried to follow 'urbanrivals' again the same error occured and gwibber stopped fetching any tweets, but still showing all tweets fetched until then. So the issue was reproducible for me at that time.
In fact, now that gwibber does not try to fetch that tweet in question any more (because it is too old) I am able follow 'urbanrivals' with gwibber without a problem.
Thanks for your reply. As I tried to explain in the description, unfollowing 'urbanrivals' did restore gwibbers normal behaviour. When I then tried to follow 'urbanrivals' again the same error occured and gwibber stopped fetching any tweets, but still showing all tweets fetched until then. So the issue was reproducible for me at that time.
In fact, now that gwibber does not try to fetch that tweet in question any more (because it is too old) I am able follow 'urbanrivals' with gwibber without a problem.