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Fixed in Unity 2017.1.0f3



Found in


Issue ID




Crash in UI::CalculateNestedAlpha when Game Object is given different parent




Priority: 2Necessary for shipping a final release


Severity: 1Crash, freeze, data loss, work stops

Editor crashes when CanvasGroup's alpha value is changed and the game object is then given a different parent in the hierarchy by Transform::SetParent.

To reproduce:
1. Open the attached project
2. Open "CrashTest" scene
3. Select "RootCanvas" -> "crash_test_bar" game object from the hierarchy
4. Right click "CrashTest" component and click "crash" item on context menu

Desired outcome: The "crash_test_bar" object is deactivated and becomes a child of "OtherNode" game object in the hierarchy.
Actual result: Editor crashes.

Reproduced with 5.5.2p4, 5.5.3p1, 5.6.0f2, 5.6.0f3, 2017.1.0b1
Not reproduced with 5.5.2p2, 5.5.2p3, 5.6.0f1, 2017.1.0a6
Regression introduced in 5.5.2p4, 5.6.0f2, 2017.1.0b1

Backported to: 5.4.5p3, 5.5.3p4, 5.6.1p1, 2017.1.0b9

Comments (2)

  1. 98907ecb61d5a22b14800c7185d9a264?d=mm


    May 11, 2017 11:17

    If you are affected by this issue and use SetActive(false) before the call to SetParent. A known workaround to the issue is to delay the call to SetActive(false) to after SetParent.

  2. F461e7016691b839eaa2d3e360dc9b68?d=mm


    Apr 16, 2017 14:19

    I'm seeing this in 5.6.0f3 as well.

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