I was not using WinSCP when it crash (the PC at work was unused, screen locked, during night).
I think it's because I was in a WinSCP's local directory that is an enterprise windows share, who has been disconnected nightly for maintenance.
Thanks

WinSCP 5.7.7

Error message:
Accès mémoire invalide.

Trace de la pile :
(003EEC07)
(00062496) ntdll.dll
(0000F13E) ntdll.dll.KiUserExceptionDispatcher
(003ECE5F)
(0034059C)
(000152F7) USER32.dll
(00015D35) USER32.dll
(000167BF) USER32.dll
(00016885) USER32.dll.DispatchMessageW

Status: unknown_rel_addr

The problem happens rarely. I cannot reproduce it.