Invalid access to memory - @@Synchronize@Finalize

<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 5.15.3

Error message:
Invalid access to memory.

Stack trace:
(002B7827)
(0092770A)
(00929772)
(0092652C)
(00087C8F) ntdll.dll

(00927D75)
(009292A8)
(0070B70B)
(008BB653)
(008BA70D) @@Synchronize@Finalize
(0001D787)
(000532BB)
(00046537)
(003E7824)
(001C640D)
(003A3E00)
(000438E9) USER32.dll
(00025137) USER32.dll
(00024289) USER32.dll
(0002406B) USER32.dll.DispatchMessageW

The problem happens rarely. I cannot reproduce it.

<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 5.15.4

Error message:
Invalid access to memory.

Stack trace:
(008BC7EF)
(00928272)
(0092A2DA)
(00927094)
(0003EF0E) ntdll.dll.ZwWow64CallFunction64
(0003F68A) ntdll.dll.KiUserExceptionDispatcher

(009288DD)
(00929E10)
(0070C23B)
(008BC17B)
(008BB235) @@Synchronize@Finalize
(0001D787)
(0004E09E)
(00046537)
(003E784C)
(001C6435)
(003A3E28)
(00007E6F) USER32.DLL.CallNextHookEx
(000080CC) USER32.DLL
(0000966A) USER32.DLL
(000096DB) USER32.DLL.DispatchMessageW

I know how to reproduce the problem or the problem happens frequently enough. I wish to be contacted by the WinSCP team to help resolving the problem.

Thanks for your report.
I have sent you an email with a debug version of WinSCP to the address you have used to register on this forum.