Greetings!

Please note when you login the game, the data is loaded into your device's memory - that's the game working principle. Every time you update the application, it takes the part of RAM on your device. This kind of failure happens in case your device cannot load the application data due to the lack of RAM or unstable Internet connection. 

Please check your Internet connection again or use another access point. Make sure that your device has enough memory after installing the update. Try to clear the cache of your browser. If the issue persists, please launch the game on another PC or mobile device.

If the issue is still relevant after performing the specified steps, please let us know. Thank you for your understanding.