Hi, thanks for reporting the bug!
Did you try refreshing the page, or does it keep happening when you get to this part? I’ve encountered a problem before where the web browser version didn’t get to load all of the game elements because of a poor internet connection, so it crashed similarly to your screenshot. In this case, either refreshing or trying another browser might help fix the problem!
Anyhow, if it still happens please let me know! Hope I can help you!