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dotnet/releases/net471/KnownIssues/481090-WPF Touch generates ...

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WPF Touch generates a NullReferenceException in WispLogic.ProcessInputReport

Symptoms

WPF throws a NullReferenceException in WispLogic.ProcessInputReport and the application may crash.

Cause

In WPF applications running on touch or stylus enabled machines, specific hardware and timing issues can cause touch messages to arrive without associated StylusDevices. When this occurs WPF tries to access this null StylusDevice, causing the error.

Resolution

This issue is fixed for all supported OS platforms prior to Windows 10 Fall Creators Update. The fix for Windows 10 Fall Creators Update is expected in a future servicing update.