External exception EEFFACE

this occurs when i am trying to copy the contents of my google drive to a backup location using SFTP to hetzner's german server.

WinSCP 6.3.7

Error message:
External exception EEFFACE

Stack trace:
(0015F714) KERNELBASE.dll.RaiseException
(000B204F) ntdll.dll
(0007AF3A) ntdll.dll.KiUserExceptionDispatcher
(00556888)
(00E25AEE)
(00E26EDF)
(00C5205F)
(00C49C9A)
(00C7FD1F)
(00C7E39C)
(00C7E935)
(00C7FA99)
(00C7E39C)
(00C7E935)
(00C7FA99)
(00C7E39C)
(00C7E935)
(00C7FA99)
(00C7E39C)
(00C7E935)
(00C7FA99)
(00C7E39C)
(00C7E935)
(00C7FA99)
(00C7E39C)
(00C7E935)
(00C7FA99)
(00C7E39C)
(00C7E935)
(00C7FA99)
(00C7E39C)
(00C7E935)
(00C7FA99)
(00C7E39C)
(00C7E1C9)
(00C4688E)
(00C7DC27)
(00011F47)
(00012B68)
(0002888D)
(00028A25)
(00AEA0EA)
(0048E04C)
(004C2E47)
(00226F7C)
(00038D21) USER32.dll
(00026E88) USER32.dll
(00026315) USER32.dll
(00025E7B) USER32.dll.DispatchMessageW

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.

@daniel.messana: 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.