<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 5.7.7

Error message:
Invalid%20access%20to%20memory.%0D%0A%0D%0AStack%20trace%3A%0D%0A%280024EABB%29%20Vcl%3A%3AComctrls%3A%3ATTreeNode%3A%3AGetTreeView%0D%0A%2800081D3F%29%20ntdll.dll%0D%0A%280006F8EA%29%20ntdll.dll.KiUserExceptionDispatcher%0D%0A%28003DEB55%29%20Customdriveview%3A%3A_16443%0D%0A%28003DEBE4%29%20Customdriveview%3A%3ATCustomDriveView%3A%3AIterateSubTree%0D%0A%28003F02FF%29%20Driveview%3A%3ATDriveView%3A%3AValidateDirectoryEx%0D%0A%28003DE8B5%29%20Customdriveview%3A%3ATCustomDriveView%3A%3AValidateDirectory%0D%0A%28001F3137%29%20Vcl%3A%3AExtctrls%3A%3ATTimer%3A%3ATimer%0D%0A%280034059C%29%20System%3A%3AClasses%3A%3A_18201%0D%0A%280002C2B1%29%20USER32.dll%0D%0A%280000D885%29%20USER32.dll%0D%0A%280000D1DF%29%20USER32.dll%0D%0A%280000CF9B%29%20USER32.dll.DispatchMessageW

Status: not_matched

The problem happens rarely. I cannot reproduce it.