I keep trying to launch ue 4.22.2 but it crashes

Development Platform & Builds
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help plzz

2

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

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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: