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I am using the app on an iPad - this is the first time the game has shut down while in play and it is at the same stage in level 1645 - when you move the frogIf the game is crashing then it could be related to your browser/computer. King recommend taking the steps in this thread before anything else so give them a try:
https://care.king.com/en/candy-crush-saga/cant-get-your-games-to-load-on-facebook-check-this-out