Thanks for your report.
I have sent you an email with a debug version of WinSCP to address you have used to register on this forum.
                
            
        
    
    
        
        
            
            
                <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 5.7.1
Error message:
External exception C0000029
Stack trace:
[77B205BE] ntdll.dll
[77AD71C6] ntdll.dll.RtlRaiseStatus
[77AD7052] ntdll.dll.KiUserExceptionDispatcher
[009F18F2] 
[009F3ADE] 
[009F0944] 
[77AD71C6] ntdll.dll.RtlRaiseStatus
[77AD7052] ntdll.dll.KiUserExceptionDispatcher
[006A6870] 
[005A4DB2] 
[005A4D27] 
[0090E41E] 
[0090E212] 
[00931D21] 
[0021D39F] 
[0021DFA8] 
[0021E02F] 
[0021E167] 
[00242FCA] 
[005927D0] 
[0037A331] 
[00550708] 
[76A9C4E4] USER32.dll
[76A9C5E2] USER32.dll
[76A9CC14] USER32.dll
[76A9CC6B] USER32.dll.DispatchMessageW