<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>

clicked the path bookmark toolbar button

<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 5.14

Error message:
Invalid access to memory.

Stack trace:
(0008435F) ntdll.dll
(00071641) ntdll.dll.KiUserExceptionDispatcher
(0002A195) std::_Tree<std::_Tset_traits<Tb2item::TTBCustomItem *, std::less<Tb2item::TTBCustomItem *>, std::allocator<Tb2item::TTBCustomItem *>, 0> >::_Buynode
(000508AF) std::vector<unsigned int, std::allocator<unsigned int> >::_Insert_n
(004A613A) Vcl::Imaging::Pngimage::TChunkIHDR::PrepareImageData
(0048EFDC) Xml::Xmldoc::_16451
(004926C6) Xml::Xmldoc::TXMLNode::GetXML
(00491857) Xml::Xmldoc::TXMLNode::FindNamespaceDecl
(0049F302) Xml::Xmldom::DOMException::
(00269C7C) __tpdsc__ Vcl::Comctrls::TUpDown
(00269CCB) __tpdsc__ Vcl::Comctrls::TUpDown
(0026E17D) __tpdsc__ Vcl::Comctrls::_TCustomListView::_1
(0026D7C4) __tpdsc__ Vcl::Comctrls::TLVCustomDrawItemEvent
(00397A58) __tpdsc__ System::Masks::TMask::TMaskState
(00047279) USER32.dll
(000381B7) USER32.dll
(000372F6) USER32.dll
(000370CB) USER32.dll.DispatchMessageW

The problem happens rarely. I cannot reproduce it.

<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 5.14

Error message:
Invalid access to memory.

Stack trace:
(00083F6F) ntdll.dll
(000717E1) ntdll.dll.KiUserExceptionDispatcher
(0002A195) std::_Tree<std::_Tset_traits<Tb2item::TTBCustomItem *, std::less<Tb2item::TTBCustomItem *>, std::allocator<Tb2item::TTBCustomItem *>, 0> >::_Buynode
(000508AF) std::vector<unsigned int, std::allocator<unsigned int> >::_Insert_n
(004A613A) Vcl::Imaging::Pngimage::TChunkIHDR::PrepareImageData

The problem happens rarely. I cannot reproduce it.