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Assessment

Difficulty
3/5
Estimated time
Half a day
Newbie friendliness
40/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Active
Tech stack
csharp
Domain
desktop

Research direction

The crash is in QueryTextBox_KeyUp in Flow.Launcher/MainWindow.xaml.cs at line 1437, per the stack trace. Start by reading that handler and finding which field or object is dereferenced there while null. The issue gives no reproduction steps, so first confirm what triggers the key-up path. Done means the handler no longer throws on that path, verified by reproducing the exception or adding a test if one exists.

Written by the indexing model from the issue text.

Description

Flow Launcher version: 2.1.4
OS Version: 26200.9711
IntPtr Length: 8
x64: True

Python Path:
Node Path:

Date: 11/03/2026 09:46:20
Exception:
System.NullReferenceException: Object reference not set to an instance of an object.
at Flow.Launcher.MainWindow.QueryTextBox_KeyUp(Object sender, KeyEventArgs e) in C:\projects\flow-launcher\Flow.Launcher\MainWindow.xaml.cs:line 1437
at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
at System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
at System.Windows.Input.InputManager.ProcessStagingArea()
at System.Windows.Interop.HwndKeyboardInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawKeyboardActions actions, Int32 scanCode, Boolean isExtendedKey, Boolean isSystemKey, Int32 virtualKey)
at System.Windows.Interop.HwndKeyboardInputProvider.ProcessKeyAction(MSG& msg, Boolean& handled)
at System.Windows.Interop.HwndSource.CriticalTranslateAccelerator(MSG& msg, ModifierKeys modifiers)
at System.Windows.Interop.HwndSource.OnPreprocessMessage(Object param)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)

Dominant language
C#
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Avg merge
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Merged PRs (30d)
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First steps

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  4. Open a pull request that references the issue number.

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