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Fixed in 1.21.17



Found in [Package]


Issue ID




Addressables.Release() throws ArgumentException when Play mode has been exited twice

Package: Addressables


Reproduction steps:
1. Open project “”
2. Open the “SampleScene”
3. Go to “Window\Asset Management\Addressables\Groups”
4. Build the Addressable Group through “Build\New Build\Default Build Script”
5. Enter and exit Play mode twice
6. Observe Console

Expected result: No errors are thrown
Actual result: “ArgumentException: An item with the same key has already been added.” is thrown

Reproducible with: 1.20.5, 1.21.15 (2021.3.30f1, 2022.3.9f1, 2023.1.12f1, 2023.2.0b9, 2023.3.0a5)
Fixed in: 1.21.17 (2021.3.30f1, 2022.3.9f1, 2023.1.12f1, 2023.2.0b9, 2023.3.0a5)

Reproducible on: macOS Ventura 13.2.1 (Intel)
Not reproducible on: no other environment tested

- The issue only reproduces when Enter Play Mode Options = On and Reload Domain = Off.
- The issue only reproduces when Play Mode Script = Use Existing Build. (Not reproduced with "Use Asset Database" or "Simulate Groups".)
- The issue reproduces when Addressables.Release() is called on OnDestroy() or OnApplicationQuit(). But does not reproduce in other MonoBehaviour events (such as Start(), Update(), etc.)

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