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.
I start the application and it attempts to connect. After multiple attempts to reconnect and I close the connection window. At that point, the bug report/error log is generated.
Invalid access to memory.
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.