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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"How to avoid \"Some objects were not cleaned up when closing the scene. (Did you spawn new GameObjects from OnDestroy?)\"","articleBody":"I think it's needed to unsubscribe from events in `OnDestroy` to prevent memory leaks, such as:\n```cs\nprivate void OnDestroy()\n{\n    if (StatsManager.Instance != null)\n    {\n        StatsManager.Instance.OnStatsChanged -= OnStatsChanged;\n    }\n}\n```\n\nThis works, except for when exiting play mode, sometimes it will log:\n```\nSome objects were not cleaned up when closing the scene. (Did you spawn new GameObjects from OnDestroy?)\n```\n\nI believe it's because:\n- Unity destroys `StatsManager` first.\n- Unity next destroys the other GameObject that unsubcribes from `StatsManager` event.\n- When checking `StatsManager.Instance != null`, it causes `StatsManager` to respawn since `StatsManager.Instance` is null. (Internal Singleton behavior)\n\nWhat's the best way to avoid this issue?","author":{"url":"https://github.com/KamilDev","@type":"Person","name":"KamilDev"},"datePublished":"2025-02-28T02:56:17.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/17/UnitySingleton/issues/17"}