Error getting name of current remote directory - System::Generics::Collections::TDictionary__2<System::TMetaClass *, System::Generics::Collections::TList__1<System::TMetaClass *> *>::Hash

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WinSCP 5.7.6

Error message:
Error getting name of current remote directory.

Invalid access to memory.

Stack trace:
(000EEB59) System::Generics::Collections::TDictionary__2<System::TMetaClass *, System::Generics::Collections::TList__1<System::TMetaClass *> *>::Hash
(007E46BA) C4799_3
(007E6722) ____ExceptionHandler
(007E369C) __ExceptionHandler
(0005A5DA) ntdll.dll
(0000F12E) ntdll.dll.KiUserExceptionDispatcher[color=white][/color]

The problem happens rarely. I cannot reproduce it.