Invalid access to memory - Vcl::Imglist::TCustomImageList::AddMasked

<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 6.1

Error message:
Invalid access to memory.

Stack trace:
(00343767) Vcl::Imglist::TCustomImageList::AddMasked
(000974CF) ntdll.dll
(00077751) ntdll.dll.KiUserExceptionDispatcher
(00514113) Pngimagelist::TPngImageList::AddMasked
(00E6F3DF) TLoginDialog::AddLoginButtonImage
(00E6E9E0) TLoginDialog::UpdateLoginButton
(00E7286A) TLoginDialog::ActionListUpdate
(00262BEC) System::Actions::TContainedActionList::UpdateAction
(003467B6) Vcl::Actnlist::TCustomAction::Update
(003B5406) Vcl::Forms::_16777
(003B5406) Vcl::Forms::_16777
(003B5484) Vcl::Forms::TCustomForm::UpdateActions

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 6.1

Error message:
Invalid access to memory.

Stack trace:
(00343767) Vcl::Imglist::TCustomImageList::AddMasked
(00087A5F) ntdll.dll
(00073F81) ntdll.dll.KiUserExceptionDispatcher
(00514113) Pngimagelist::TPngImageList::AddMasked
(00E6F3DF) TLoginDialog::AddLoginButtonImage
(00E6E9E0) TLoginDialog::UpdateLoginButton
(00E7286A) TLoginDialog::ActionListUpdate
(00262BEC) System::Actions::TContainedActionList::UpdateAction
(003467B6) Vcl::Actnlist::TCustomAction::Update
(003B5406) Vcl::Forms::_16777
(003B5406) Vcl::Forms::_16777
(003B5484) Vcl::Forms::TCustomForm::UpdateActions

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 6.1.1

Error message:
Ongeldige toegang tot geheugen.

Stack trace:
(003437CB) Vcl::Imglist::TCustomImageList::AddMasked
(00087A5F) ntdll.dll
(00073F81) ntdll.dll.KiUserExceptionDispatcher
(00514177) Pngimagelist::TPngImageList::AddMasked
(00E6DCE3) TLoginDialog::AddLoginButtonImage
(00E6D2E4) TLoginDialog::UpdateLoginButton
(00E7116E) TLoginDialog::ActionListUpdate
(00262C50) System::Actions::TContainedActionList::UpdateAction
(0034681A) Vcl::Actnlist::TCustomAction::Update
(003B546A) Vcl::Forms::_16777
(003B546A) Vcl::Forms::_16777
(003B54E8) Vcl::Forms::TCustomForm::UpdateActions

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 6.1.1

Error message:
Invalid access to memory.

Stack trace:
(003437CB) Vcl::Imglist::TCustomImageList::AddMasked
(00087A5F) ntdll.dll
(00073F81) ntdll.dll.KiUserExceptionDispatcher
(00514177) Pngimagelist::TPngImageList::AddMasked
(00E6DCE3) TLoginDialog::AddLoginButtonImage
(00E6D2E4) TLoginDialog::UpdateLoginButton
(00E7116E) TLoginDialog::ActionListUpdate
(00262C50) System::Actions::TContainedActionList::UpdateAction
(0034681A) Vcl::Actnlist::TCustomAction::Update
(003B546A) Vcl::Forms::_16777
(003B546A) Vcl::Forms::_16777
(003B54E8) Vcl::Forms::TCustomForm::UpdateActions

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 6.1

Error message:
Invalid access to memory.

Stack trace:
(00343767) Vcl::Imglist::TCustomImageList::AddMasked
(000981DF) ntdll.dll
(00077D51) ntdll.dll.KiUserExceptionDispatcher
(00514113) Pngimagelist::TPngImageList::AddMasked
(00E6F3DF) TLoginDialog::AddLoginButtonImage
(00E6E9E0) TLoginDialog::UpdateLoginButton
(00E7286A) TLoginDialog::ActionListUpdate
(00262BEC) System::Actions::TContainedActionList::UpdateAction
(003467B6) Vcl::Actnlist::TCustomAction::Update
(003B5406) Vcl::Forms::_16777
(003B5406) Vcl::Forms::_16777
(003B5484) Vcl::Forms::TCustomForm::UpdateActions

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 6.3.1

Error message:
Unzulässiger Zugriff auf einen Speicherbereich.

Stapelverfolgung:
(00355F27) Vcl::Imglist::TCustomImageList::AddMasked
(0009819F) ntdll.dll
(00077DB1) ntdll.dll.KiUserExceptionDispatcher
(00526D27) Pngimagelist::TPngImageList::AddMasked
(00CD660F) TLoginDialog::AddLoginButtonImage
(00CD5C10) TLoginDialog::UpdateLoginButton
(00CD9A36) TLoginDialog::ActionListUpdate
(00275080) System::Actions::TContainedActionList::UpdateAction
(00358F76) Vcl::Actnlist::TCustomAction::Update
(003C7BC6) Vcl::Forms::_16777
(003C7BC6) Vcl::Forms::_16777
(003C7C44) Vcl::Forms::TCustomForm::UpdateActions

The problem happens rarely. I cannot reproduce it.