Null pointer access during startup in twinapi.appcore.dll #1779

New Issue

claunia · 2026-01-30T22:36:17Z

claunia commented

2026-01-30 22:36:17 +00:00

Originally created by @mauve on GitHub (Jun 20, 2019).

Environment

Windows build number: `Microsoft Windows [Version 10.0.18917.1000]`
Windows Terminal version (if applicable): `440bee0e4abd0a778cbdff5b86f73fb34a92f3ed`

Steps to reproduce

Start

Expected behavior

Do not crash

Actual behavior

Exception thrown at 0x00007FF9FB23371C (twinapi.appcore.dll) in WindowsTerminal.exe: 0xC0000005: Access violation reading location 0x0000000000000000.

Crashes with the following stack trace:

 	twinapi.appcore.dll!Microsoft::WRL::ComPtr<struct Windows::Phone::UI::Core::INavigationClient>::As<struct Windows::Internal::ApplicationModel::WindowManagement::INavigationClient_AdapterOwner>(class Microsoft::WRL::Details::ComPtrRef<class Microsoft::WRL::ComPtr<struct Windows::Internal::ApplicationModel::WindowManagement::INavigationClient_AdapterOwner> >)	Unknown
 	twinapi.appcore.dll!Windows::ApplicationModel::Core::CoreApplicationViewTitleBar::_TryGetTitleBarClientAdapter(struct Windows::Internal::ApplicationModel::WindowManagement::ITitleBarClientAdapter * *)	Unknown
 	twinapi.appcore.dll!Windows::ApplicationModel::Core::CoreApplicationViewTitleBar::add_IsVisibleChanged(struct Windows::Foundation::ITypedEventHandler<class Windows::ApplicationModel::Core::CoreApplicationViewTitleBar *,struct IInspectable *> *,struct EventRegistrationToken *)	Unknown
 	Microsoft.VisualStudio.DesignTools.UwpTap.dll!Microsoft::VisualStudio::DesignTools::UwpTap::InAppUI::InAppMenu::LoadInAppMenu(void)	Unknown
 	Microsoft.VisualStudio.DesignTools.UwpTap.dll!std::_Func_impl<<lambda>(void),std::allocator<int>,long>::_Do_call()	Unknown
 	Microsoft.VisualStudio.DesignTools.UwpTap.dll!std::_Func_impl<<lambda>(void),std::allocator<int>,void>::_Do_call()	Unknown
 	Microsoft.VisualStudio.DesignTools.UwpTap.dll!Microsoft::VisualStudio::DesignTools::UwpTap::PackagedTask<void>::operator()(void)	Unknown
 	Microsoft.VisualStudio.DesignTools.UwpTap.dll!winrt::Windows::UI::Core::impl_DispatchedHandler<<lambda>(void) >::abi_Invoke()	Unknown
 	[Inline Frame] Windows.UI.dll!Windows::UI::Core::CDispatcher::EnqueueAsyncWork::__l16::<lambda_59517943c03487243f9bea31c6c1a784>::operator()() Line 908	C++
 	Windows.UI.dll!Microsoft::WRL::Details::DelegateArgTraits<long (__cdecl Windows::System::IDispatcherQueueHandler::*)(void)>::DelegateInvokeHelper<Microsoft::WRL::Implements<Microsoft::WRL::RuntimeClassFlags<2>,Windows::System::IDispatcherQueueHandler,Microsoft::WRL::FtmBase>,<lambda_59517943c03487243f9bea31c6c1a784>,-1>::Invoke() Line 245	C++
 	CoreMessaging.dll!Windows::System::DispatcherQueue::DeferInvokeCallback()	Unknown
 	CoreMessaging.dll!Microsoft__CoreUI__Dispatch__TimeoutHandler$CallbackThunk(class System::Delegate *)	Unknown
 	CoreMessaging.dll!Microsoft::CoreUI::Dispatch::DeferredCall::Callback_Dispatch(void)	Unknown
 	CoreMessaging.dll!Microsoft::CoreUI::Dispatch::DeferredCallDispatcher::Callback_OnDispatch()	Unknown
 	CoreMessaging.dll!Microsoft::CoreUI::Dispatch::EventLoop::Callback_RunCoreLoop(struct Microsoft::CoreUI::Dispatch::RunMode,bool,bool &)	Unknown
 	CoreMessaging.dll!Microsoft::CoreUI::Dispatch::UserAdapter::OnUserDispatch(bool,struct Microsoft::CoreUI::Dispatch::UserAdapterBase__UserPriority,struct System::IntPtr &)	Unknown
 	CoreMessaging.dll!Microsoft::CoreUI::Dispatch::UserAdapter_DoWork()	Unknown
 	CoreMessaging.dll!Microsoft::CoreUI::Dispatch::UserAdapter_WindowProc()	Unknown
 	user32.dll!UserCallWinProcCheckWow()	Unknown
 	user32.dll!DispatchMessageWorker()	Unknown
>	WindowsTerminal.exe!wWinMain(HINSTANCE__ * __formal, HINSTANCE__ * __formal, wchar_t * __formal, int __formal) Line 50	C++
 	[External Code]

Originally created by @mauve on GitHub (Jun 20, 2019). # Environment ```none Windows build number: `Microsoft Windows [Version 10.0.18917.1000]` Windows Terminal version (if applicable): `440bee0e4abd0a778cbdff5b86f73fb34a92f3ed` ``` # Steps to reproduce - Start # Expected behavior Do not crash # Actual behavior `Exception thrown at 0x00007FF9FB23371C (twinapi.appcore.dll) in WindowsTerminal.exe: 0xC0000005: Access violation reading location 0x0000000000000000.` Crashes with the following stack trace: ``` twinapi.appcore.dll!Microsoft::WRL::ComPtr<struct Windows::Phone::UI::Core::INavigationClient>::As<struct Windows::Internal::ApplicationModel::WindowManagement::INavigationClient_AdapterOwner>(class Microsoft::WRL::Details::ComPtrRef<class Microsoft::WRL::ComPtr<struct Windows::Internal::ApplicationModel::WindowManagement::INavigationClient_AdapterOwner> >) Unknown twinapi.appcore.dll!Windows::ApplicationModel::Core::CoreApplicationViewTitleBar::_TryGetTitleBarClientAdapter(struct Windows::Internal::ApplicationModel::WindowManagement::ITitleBarClientAdapter * *) Unknown twinapi.appcore.dll!Windows::ApplicationModel::Core::CoreApplicationViewTitleBar::add_IsVisibleChanged(struct Windows::Foundation::ITypedEventHandler<class Windows::ApplicationModel::Core::CoreApplicationViewTitleBar *,struct IInspectable *> *,struct EventRegistrationToken *) Unknown Microsoft.VisualStudio.DesignTools.UwpTap.dll!Microsoft::VisualStudio::DesignTools::UwpTap::InAppUI::InAppMenu::LoadInAppMenu(void) Unknown Microsoft.VisualStudio.DesignTools.UwpTap.dll!std::_Func_impl<<lambda>(void),std::allocator<int>,long>::_Do_call() Unknown Microsoft.VisualStudio.DesignTools.UwpTap.dll!std::_Func_impl<<lambda>(void),std::allocator<int>,void>::_Do_call() Unknown Microsoft.VisualStudio.DesignTools.UwpTap.dll!Microsoft::VisualStudio::DesignTools::UwpTap::PackagedTask<void>::operator()(void) Unknown Microsoft.VisualStudio.DesignTools.UwpTap.dll!winrt::Windows::UI::Core::impl_DispatchedHandler<<lambda>(void) >::abi_Invoke() Unknown [Inline Frame] Windows.UI.dll!Windows::UI::Core::CDispatcher::EnqueueAsyncWork::__l16::<lambda_59517943c03487243f9bea31c6c1a784>::operator()() Line 908 C++ Windows.UI.dll!Microsoft::WRL::Details::DelegateArgTraits<long (__cdecl Windows::System::IDispatcherQueueHandler::*)(void)>::DelegateInvokeHelper<Microsoft::WRL::Implements<Microsoft::WRL::RuntimeClassFlags<2>,Windows::System::IDispatcherQueueHandler,Microsoft::WRL::FtmBase>,<lambda_59517943c03487243f9bea31c6c1a784>,-1>::Invoke() Line 245 C++ CoreMessaging.dll!Windows::System::DispatcherQueue::DeferInvokeCallback() Unknown CoreMessaging.dll!Microsoft__CoreUI__Dispatch__TimeoutHandler$CallbackThunk(class System::Delegate *) Unknown CoreMessaging.dll!Microsoft::CoreUI::Dispatch::DeferredCall::Callback_Dispatch(void) Unknown CoreMessaging.dll!Microsoft::CoreUI::Dispatch::DeferredCallDispatcher::Callback_OnDispatch() Unknown CoreMessaging.dll!Microsoft::CoreUI::Dispatch::EventLoop::Callback_RunCoreLoop(struct Microsoft::CoreUI::Dispatch::RunMode,bool,bool &) Unknown CoreMessaging.dll!Microsoft::CoreUI::Dispatch::UserAdapter::OnUserDispatch(bool,struct Microsoft::CoreUI::Dispatch::UserAdapterBase__UserPriority,struct System::IntPtr &) Unknown CoreMessaging.dll!Microsoft::CoreUI::Dispatch::UserAdapter_DoWork() Unknown CoreMessaging.dll!Microsoft::CoreUI::Dispatch::UserAdapter_WindowProc() Unknown user32.dll!UserCallWinProcCheckWow() Unknown user32.dll!DispatchMessageWorker() Unknown > WindowsTerminal.exe!wWinMain(HINSTANCE__ * __formal, HINSTANCE__ * __formal, wchar_t * __formal, int __formal) Line 50 C++ [External Code] ```

claunia added the Issue-Question Needs-Triage Resolution-Answered Product-Meta Area-Build labels 2026-01-30 22:36:17 +00:00

claunia closed this issue

2026-01-30 22:36:17 +00:00

claunia commented

2026-01-30 22:36:18 +00:00

@zadjii-msft commented on GitHub (Jun 20, 2019):

This is crazy intermittent, but if you disable the "Enable UI Debugging Tools for XAML" setting in VS, it'll fix it:

@zadjii-msft commented on GitHub (Jun 20, 2019): This is crazy intermittent, but if you disable the "Enable UI Debugging Tools for XAML" setting in VS, it'll fix it: ![image](https://user-images.githubusercontent.com/18356694/59866529-648b5e00-9351-11e9-8f01-ff59f523858f.png)

claunia commented

2026-01-30 22:36:18 +00:00

@mauve commented on GitHub (Jun 20, 2019):

thanks it works now

@mauve commented on GitHub (Jun 20, 2019): thanks it works now

claunia referenced this issue

2026-01-31 09:04:38 +00:00

[PR #1779] [MERGED] Updated link to docs #24660

claunia referenced this issue

2026-01-31 09:04:39 +00:00

[PR #1779] Updated link to docs #24665

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dev/migrie/f/632-on-warning-dialog

dev/lhecker/rgba

dev/migrie/b/8480-keybindings-in-tabs

release-1.11

dev/migrie/b/11561-dead-ends

dev/migrie/oct-21-roadmap-update

dev/migrie/fhl/adaptive-card-extension

dev/cazamor/test/11440

dev/migrie/f/warning-dlg-automation

dev/migrie/b/1.12-crash-on-exit

dev/migrie/b/11146-next-tab-in-cmdpal

release-1.10

dev/migrie/5ff9a24-and-75e2b5f

dev/duhowtt/hax/cpal-jumplist-async

dev/lelian/actionid/1

dev/migrie/f/just-elevated-state

dev/lhecker/terminal-settings-cleanup

dev/migrie/gh-10824

dev/pabhoj/cursor_light

dev/migrie/oop/wandavision

dev/migrie/oop/endgame

dev/migrie/oop/infinity-war

dev/lhecker/app-state-actually-hidden

dev/migrie/b/6160-dynamic-default-warning

dev/mgirie/b/more-nchhittest-ideas

dev/migrie/b/9320-interfacial-separation

cinnamon/fhl/find-contextmenu

dev/lhecker/wsl-distro-generator-cleanup

dev/migrie/b/10875-but-more-clever

dev/migrie/b/broken-globalsummon-overloading

dev/duhowett/hax/rle-row

dev/migrie/fhl-2021/cmdpal-select-list

dev/migrie/fhl-2021/differential-pixel-shading

dev/duhowett/hax/no-writable-glyphat

dev/migrie/fhl-2021/more-shader-variables

dev/migrie/titlebar-shenannigans

dev/miniksa/win10_font_matching

dev/lhecker/conhost-oom

dev/migrie/b/10332-less-snappy-scrolling

dev/migrie/b/7422-1px-top-border

release-1.9

dev/cazamor/move-scratch

release-1.8

dev/miniksa/manifest_2

release-1.6

release-1.7

dev/migrie/oop/the-whole-thing

dev/migrie/oop/connection-factory

dev/migrie/f/quake-dropdown-2

dev/miniksa/rle2

dev/migrie/f/quake-toCurrent-experiments-2

dev/migrie/f/quake-toCurrent-experiments

dev/migrie/f/quake-dropdown

dev/cazamor/actions-page/template

dev/duhowett/hax/cursor_stamp_foreground_background

dev/migrie/f/1860-hey-might-was-well-hack-during-a-hackathon

dev/migrie/oop-terminal.control-split-control

dev/duhowett/hax/build-with-wholearchive

dev/cazamor/spec/tsm-actions-temp

dev/migrie/oop-tear-apart-control

dev/migrie/oop-scratch-3

dev/cazamor/sui/bugfix-reload-crash

dev/migrie/f/xmacro

dev/cazamor/sui/proto/profile-nav-view

dev/migrie/f/name-windows

dev/migrie/dol/messing-with-shaders-take-1

release-1.5

dev/cazamor/sui/inheritance-hyperlinks-test

dev/migrie/r/commandline-lib-002

dev/migrie/f/com.fabrikam.toaster

dev/cazamor/adaptive-cards-prototype

dev/migrie/f/commandline-lib

dev/miniksa/zipzoom2

dev/migrie/f/remote-commandlines

dev/migrie/f/632-elevated-profiles

dev/migrie/oop-broker-000

dev/migrie/fix-pr-7015

dev/duhowett/clang

dev/miniksa/input_tests_2

dev/miniksa/input2

dev/migrie/oop-rpc-000

release-1.4

dev/migrie/oop-mixed-elevation-1

dev/migrie/oop-window-content-1

cinnamon/open-json

dev/miniksa/input_tests

dev/duhowett/hax/tsm-graphviz

dev/miniksa/input

dev/duhowett/hax/caption_buttons

release-1.3

dev/cazamor/a11y/expand-line-under-viewport

dev/cazamor/acc/ch/word-nav-perf

dev/cazamor/spec/settings-ui-architecture-draft

dev/duhowett/hax/tap_upgrade

dev/migrie/f/pane-exit-animation

release-1.2

dev/migrie/move-lib-up-and-dll-down

release-1.1

dev/migrie/f/branch-2-backup

dev/migrie/f/settings-getters-only

dev/duhowett/hax/command_palette_search

dev/migrie/f/6856-let-terminalpage-expandcommands

dev/migrie/f/theming-2020

dev/migrie/oop-scratch-4

dev/duhowett/hax/punchout

dev/migrie/s/action-ids

dev/migrie/f/lets-just-generate-these

dev/migrie/oop-scratch-2

dev/miniksa/dcomp

dev/miniksa/gotta_go_fast_spsc

dev/miniksa/gotta_go_fast

dev/miniksa/perf_skip_checks

dev/miniksa/perf_buffer_dig

dev/migrie/s/1203-cursorTextColor

dev/migrie/f/fix-intellisense-i-guess-backup

release-1.0

dev/migrie/f/execute-commandlines

dev/migrie/f/2046-Command-Palette-v2

dev/migrie/b/6421-passthrough-alt

dev/migrie/b/moving-focus-is-hard

dev/miniksa/set

dev/migrie/f/1203-phase-1

dev/migrie/f/get-localtests-in-ci

dev/cazamor/drag-panes

dev/cazamor/tile-background

release-0.11

dev/duhowett/dev/duhowett/hax/appstate_remember

dev/duhowett/load_condrv

dev/duhowett/hax/wpf_win_8_hax

dev/migrie/b/3088-weird-exact-wrap-resize

release-0.10

dev/migrie/b/4591-custom-scaling-bug

dev/duhowett/hax/attr_smuggling

dev/migrie/b/5161-mingw-vim-fix

dev/miniksa/dx_bitmap

dev/migrie/b/1503-try-messing-with-cooked-read

dev/duhowett/eyebeam

dev/migrie/b/5113-experiments

dev/duhowett/hax-selection-exclusive

dev/migrie/f/more-vt-renderer-tracing

dev/miniksa/bitmap

dev/duhowett/wprp

dev/miniksa/bitmap-mad-with-power

dev/migrie/f/resize-quirk

dev/migrie/f/reflow-buffer-on-resize-002

wpf-renderer-revert

dev/miniksa/draw

release-0.9

dev/miniksa/tabs-color-fix

dev/miniksa/4309

dev/migrie/f/just-wrapping

dev/migrie/b/3490-try-another-resize-algo

release-0.8

dev/migrie/b/3490-a-simpler-resize

dev/migrie/b/3490-resize-down

dev/miniksa/4254

dev/migrie/f/conpty-wrapped-lines-2

dev/migrie/b/be-better-at-hiding

dev/migrie/f/3327-xaml-theming-proto

dev/miniksa/gardening2

release-0.7

dev/duhowett/conpty-flags

dev/migrie/f/603-vintage-opacity

dev/migrie/PR#3181-comments

dev/duhowett/font-64

release-0.5

dev/migrie/b/663-paste-lf-always

dev/migrie/b/2011-reordered-fallthrough-strings

dev/migrie/b/411-init-tab-stops

dev/migrie/b/json-patching-is-hard

dev/migrie/b/2455-try-getting-tests-working

dev/migrie/b/1223-change-256-table

dev/migrie/f/2171-openterm.cmd

dev/migrie/f/drag-panes

dev/migrie/f/2046-command-palette

release-0.3

dev/miniksa/manager

dev/migrie/f/non-terminal-panes

dev/migrie/f/passthrough-2019

dev/miniksa/shared_pch

dev/migrie/f/1897-less-duplicated-work

release-0.2

dev/cazamor/mcs/viewport-selection

dev/duhowett/version_hack

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Reference: starred/terminal#1779

Null pointer access during startup in twinapi.appcore.dll #1779

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Expected behavior

Actual behavior

Null pointer access during startup in `twinapi.appcore.dll` #1779