[BUG - FIXED] Game end

In game 21 I had to draw 5 tiles but there were only 4 tiles left. Should in this case not the game end immediately?

Instead the game seems to be going on. Is this a bug or have I missed something?

I think you're right (having a look at the history, the 5th tile you won has a strange shape...)

indeed. the game is over, I am checking what went wrong.

bug fixed