Board Thread:Game Discussions/@comment-184.59.19.68-20131226205549/@comment-27862737-20170128223804

Try to Force Stop the app, clear the cache (not data), then try again. If that doesn't work, the other possibility would be to remove and reinstall and see if that "does the trick". If you're linked via Google Play games, you will be fine to remove and reinstall.

If not, you should still be okay, but ask an in-game friend for your Friend Code, main knight's armor, stats and your level just in case you lose it, then you can forward to Gree with all that information to get it recovered.