Invalid access to memory

When deleting some thousands of locally stored files in WinSCP 5.15.3 on my I7 16GB RAM - Win7 64bit
after some hours of waiting I get:
Error message:
Invalid access to memory.
Stack trace:
(00812F04)
(0092770A)
(00929772)
(0092652C)
(0006246E) ntdll.dll
(0000F12E) ntdll.dll.KiUserExceptionDispatcher
(0081E4FB)
(0081F496)
(000104C1)
(0001057B)
(0001070C)
(00010793)
(00042346)
(003E7824)

(00927D75)
(0092934F)
(00015DEA)
(000104C1)
(0001057B)
(0001070C)
(00010793)
(00042346)
(003E7824)

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.

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.

This bug has been added to the tracker:
https://winscp.net/tracker/1836