Rated Game # 55131468 started, opponent resigned.
After that, I wanted to end the game against the bot. Well it
st the game frozen.
Unfortunately, there are a few cards that the bot may hang on. Graverobber is one of them, and in this game your opponent had one, the bot plays it and hangs. That mostly happens with continuations as yours, because the bot itself never buys a Graverobber.
When I log in, I keep having the frozen game.
In my case (when I load the game), I can simply resign. It should work for your as well. It if doesn't work, open a private (Firefox) or incognito (Chrome) window in your browser, go to "dominion.games", enter your user name and password, but don't login
! Instead, below the "Sign Up" button, is text "Kick & Resign". That is actually a button and allows you to end the game "from the outside". Click that text and then you can login normally.
That happened to me a few weeks ago at a rated game. the victory was then not counted.
How can this happen
Are you saying that a game against a human player hang? Did you try undo and/or CTRL-R?