Invalid access to memory - MenuPopup

When trying to edit an IP address or port using the context menu.
Windows 7 x64
WinSCP v5.12.2(8117)

Stack trace:
(000A3AF5) MenuPopup
(0006248E) ntdll.dll
(0000F15E) ntdll.dll.KiUserExceptionDispatcher
(000D606B) MenuPopup
(00256596) Vcl::Controls::TControl::DoContextPopup

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This bug has been added to the tracker:
https://winscp.net/tracker/1605