UUM-142693

Fixed in 6000.6.0b1

Mentioned in 12 release notes.

First fixed in 6000.6.0b1 (Jun 23, 2026); relisted in 11 later releases.

Open on Unity Issue Tracker
VersionSectionRiskImpactNote
6000.6.0b9Fixes
UI Toolkit
FixFixed the UI Builder null reference exception when triggering an undo/redo right after existing context mode.
6000.6.0b8Fixes
UI Toolkit
FixFixed the UI Builder null reference exception when triggering an undo/redo right after existing context mode.
6000.6.0b7Fixes
UI Toolkit
FixFixed the UI Builder null reference exception when triggering an undo/redo right after existing context mode.
6000.6.0b6Fixes
UI Toolkit
FixFixed the UI Builder null reference exception when triggering an undo/redo right after existing context mode.
6000.6.0b5Fixes
UI Toolkit
FixFixed the UI Builder null reference exception when triggering an undo/redo right after existing context mode.
6000.6.0b4Fixes
UI Toolkit
FixFixed the UI Builder null reference exception when triggering an undo/redo right after existing context mode.
6000.6.0b3Fixes
UI Toolkit
FixFixed the UI Builder null reference exception when triggering an undo/redo right after existing context mode.
6000.6.0b2Fixes
UI Toolkit
FixFixed the UI Builder null reference exception when triggering an undo/redo right after existing context mode.
6000.3.19f1Fixes
UI Toolkit
FixFixed the UI Builder null reference exception when triggering an undo/redo right after existing context mode.
6000.5.1f1Fixes
UI Toolkit
FixFixed the UI Builder null reference exception when triggering an undo/redo right after existing context mode.
6000.6.0b1Fixes
UI Toolkit
FixFixed the UI Builder null reference exception when triggering an undo/redo right after existing context mode.
6000.6.0b1Fixes
UI Toolkit
FixFixed the UI Builder null reference exception when triggering an undo/redo right after existing context mode.

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