Invalid access to memory

1. Connection lost to host
2. Reconnect via dialog window automatically shown after OK button clicked in error message

WinSCP 5.19.4

Error message:
Invalid access to memory.

Stack trace:
(0043AD84) System::HandleAnyException
(000878AF) ntdll.dll
(00073EE1) ntdll.dll.KiUserExceptionDispatcher
(003C7A98) System::Classes::_18201
(00042489) USER32.dll
(00039425) USER32.dll
(00037195) USER32.dll
(00036F5B) USER32.dll.DispatchMessageW

Status: all_insignificant

The problem happens rarely. I cannot reproduce it.