无效的内存访问。

<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 5.9

Error message:
无效的内存访问。

Stack trace:
(0064845D)
(0086216E)
(008641D6)
(00860F90)
(0008A61F) ntdll.dll
(00077E7A) ntdll.dll.KiUserExceptionDispatcher
(00645932)
(00645E37)
(00649BB0)
(00649C81)
(00615B3D)
(0061BD1B)
(006285E9)
(006F537B)
(0076D844)
(0076C166)
(0076DE53)
(006C57B9)
(006C0780)
(0009836F)
(000128F2) KERNEL32.DLL.BaseThreadInitThunk
(00064DE1) ntdll.dll
(00064DA9) ntdll.dll

(008627D9)
(00863DB3)
(006F5538)
(0076D844)
(0076C166)
(0076DE53)
(006C57B9)
(006C0780)
(0009836F)
(000128F2) KERNEL32.DLL.BaseThreadInitThunk
(00064DE1) ntdll.dll
(00064DA9) ntdll.dll

(008627D9)
(00863DB3)
(0076D8D6)
(0076C166)
(0076DE53)
(006C57B9)
(006C0780)
(0009836F)
(000128F2) KERNEL32.DLL.BaseThreadInitThunk
(00064DE1) ntdll.dll
(00064DA9) ntdll.dll

(008627D9)
(00863DB3)
(0076CB45)
(0076DE53)
(006C57B9)
(006C0780)
(0009836F)
(000128F2) KERNEL32.DLL.BaseThreadInitThunk
(00064DE1) ntdll.dll
(00064DA9) ntdll.dll

Status: unknown_rel_addr

The problem happens rarely. I cannot reproduce it.