<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 5.15.9

Error message:
Range check error

Traza de la pila:
(0041A6D1)
(0041A6D1)
(0041A8B1)
(003CEBD1)
(003CEB7C)
(006F25D3)
(000C6077)
(007062CA)
(007064AF)
(00926161)
(000488EC) ntdll.dll
(000488BF) ntdll.dll

Status: unknown_rel_addr

The problem happens rarely. I cannot reproduce it.