If on Android, force close the app. If that still doesn't work, clear the game cache and try again. If all else fails, uninstall and reinstall the app. Make absolutely sure you're logged into Google Play prior to doing such, or you will potentially lose your data!!!
If on iOS, same situation applies, force close, then if that doesn't work then uninstall and reinstall the app, but make absolutely sure you're logged into Game Center before doing such!!!
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If on iOS, same situation applies, force close, then if that doesn't work then uninstall and reinstall the app, but make absolutely sure you're logged into Game Center before doing such!!!
Nudging this where it belongs, but it appears @TGDXHyp3z has you handled!