I keep trying to launch ue 4.22.2 but it crashes

help plzz

You won’t get any help if you don’t provide any crash details or logs.

My started crashing this evening as well. 4.23 works fine, but 4.22.3 suddenly started crashing at 73% with an error:
Cast of nullptr to None failed.

[2019.10.14-00.22.47:407][509]LogWindows: Windows GetLastError: The operation completed successfully. (0)
[2019.10.14-00.23.47:407][509]LogWindows: Error: === Critical error: ===
[2019.10.14-00.23.47:407][509]LogWindows: Error:
[2019.10.14-00.23.47:407][509]LogWindows: Error: Fatal error: [File:D:\Build++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\Templates\Casts.cpp] [Line: 10]
[2019.10.14-00.23.47:407][509]LogWindows: Error: Cast of nullptr to None failed
[2019.10.14-00.23.47:407][509]LogWindows: Error: