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Duplicate

Votes

4

Found in

6000.0.58f1

6000.2.6f1

Issue ID

UUM-120423

Regression

Yes

Errors are thrown and Inspector's UI element is not drawing when a GameObject with script component using a List<T> attached is selected

-

How to reproduce:
1. Open the ‘IN-117004' project
2. Open the ‘Scene’ scene
3. Select the ‘Example’ GameObject in the Hierarchy
4. Observe the result in the Inspector’s script component with a List<T> and Console

Expected result: The icons ‘' and '-’ are visible and no errors are displayed
Actual result: The icons ‘' and '-’ are not visible and errors are displayed

Reproducible with: 6000.0.58f1, 6000.2.5f1, 6000.2.6f1
Not reproducible with: 6000.2.4f1, 6000.3.0b3, 6000.4.0a1

Reproducible on: macOS 26.0 (M1 Max)
Not reproducible on: No other environment tested

Note: Console throws out these errors:
- ‘UnityException: GetName can only be called from the main thread’
- ‘NullReferenceException: Object reference not set to an instance of an object'
- ’InvalidOperationException: Operations that change non-concurrent collections must have exclusive access. A concurrent update was performed on this collection and corrupted its state. The collection's state is no longer correct.'

  1. This is a duplicate of issue #UUM-119358

    "UnityException: GetName can only be called from the main thread." erors are thrown when the Shortcuts window is opened and entering Play Mode with a shortcut

  1. Resolution Note:

    null
    Duplicate of https://issuetracker.unity3d.com/product/unity/issues/guid/UUM-119358

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Comments (5)

  1. dominic_k90

    Oct 06, 2025 09:09

    I also agree it's not a duplicate and it is NOT fixed!

  2. Arganoid

    Oct 03, 2025 21:49

    I'll add that I don't see the GetName error, what I see is that if I click on a scriptable object containing lists, I get errors like:

    NullReferenceException: Object reference not set to an instance of an object

    And also

    InvalidOperationException: Operations that change non-concurrent collections must have exclusive access. A concurrent update was performed on this collection and corrupted its state. The collection's state is no longer correct.

    I'd post the full stack traces, but it won't let me because it incorrectly says that they contain URLs.

  3. Arganoid

    Oct 03, 2025 21:45

    Agree with the other comments, this has nothing to do with the one it's meant to be a duplicate of.

  4. SpaceMoose9k

    Oct 03, 2025 16:40

    I agree with Withaust. This issue is separate from the Play button issue. This is for List<T> collections in the inspector.

  5. Withaust

    Sep 30, 2025 06:30

    Why exactly was this closed as a duplicate? The supposed duplicate issue is closed with 6000.2.6f1, but THIS issue is still happening in that same version.

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