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.

<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 5.13.5

Error message:
Stream write error

Трассировка стека:
(0036C353)
(0036C2D7)
(00367320)
(006E1528)
(000C0F17)
(000C0F8B)
(0009622F)
(00096AD4)
(0009685E)
(000024B4)
(008BCD75)
(00038900) ntdll.dll
(000388D0) ntdll.dll

Status: unknown_rel_addr

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.