<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 5.7.7

Error message:
Während des Protokollierens ist ein Fehler aufgetreten. Das Protokollieren wurde abgeschaltet.

Out of memory

Stack trace:
(003B4B00)
(003B4B00)
(003B4C31)
(003275B3)
(006CB4F8)
(006CB638)
(006CB16B)
(006CB5C0)
(006D6F83)
(00708B2E)
(006FBE1C)
(006F97F8)
(006F8986)
(00723D75)
(00674A9B)
(00672277)
(00670728)
(0008269F)
(00012388) kernel32.dll.BaseThreadInitThunk
(00038F70) ntdll.dll
(00038F40) ntdll.dll

Status: unknown_rel_addr

The problem happens rarely. I cannot reproduce it.