11 lines
647 B
Markdown
11 lines
647 B
Markdown
# WPF Touch generates a NullReferenceException in WispLogic.ProcessInputReport
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## Symptoms
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WPF throws a NullReferenceException in WispLogic.ProcessInputReport and the application may crash.
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## Cause
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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.
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## Resolution
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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.
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