We're very sorry! If your game crashes and you're not able to rejoin the server you were in, here are some steps to try: 

• Restart the app
• Uninstall the game, restart your device and reinstall the game
• Clear the game's cache and data, uninstall the game, restart your device and reinstall the game

Please note that if you were hosting the server, it's possible that you won't be able to retrieve it if your game crashes.