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UCEERR_ILLEGALHANDLE
UCEERR_ILLEGALHANDLE is a Windows User Composition Engine (UCE) HRESULT. It indicates that a command refers to a composition resource handle that is invalid for the current channel or object state.
What to check for UCEERR_ILLEGALHANDLE
- Check object lifetime and do not reuse resources after disposal, shutdown, or dispatcher termination.
- Review interop code that passes graphics, window, or composition resources between layers.
- Confirm that UI work is performed on the dispatcher that owns the affected objects.
Microsoft guidance for WPF render-thread failures
Diagnostic interpretation
This result has the HRESULT value 0x88980404. AllStat records the condition as “it”.
Evidence to capture
- Capture any IErrorInfo text, activity identifier, event-log entry, and subsystem trace that mentions this result or the uceerr / illegalhandle operation.
- check the documented return contract of the specific API because the same HRESULT can require different recovery in different interfaces.
Retry and recovery
Retry this result only when the owning API documents a transient state or after the condition described as “it” has changed.
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