bevyengine/bevy · error · InvalidGenerationError

AssetIndex {index:?} has been removed

Error message

AssetIndex {index:?} has been removed

What it means

InvalidGenerationError variant indicating the AssetIndex's index entry has been removed entirely: the slot generation no longer exists because the asset at that index was dropped. Any handle still pointing at this index cannot be resolved to a live asset.

Source

Thrown at crates/bevy_asset/src/assets.rs:743

            None
        }
    }
}

/// An error returned when an [`AssetIndex`] has an invalid generation.
#[derive(Error, Debug, PartialEq, Eq)]
pub enum InvalidGenerationError {
    /// The generation of this [`AssetIndex`] does not match the current generation.
    /// That means its index entry has been replaced.
    #[error("AssetIndex {index:?} has an invalid generation. The current generation is: '{current_generation}'.")]
    Occupied {
        /// The index being looked up.
        index: AssetIndex,
        /// The generation currently at that index.
        current_generation: u32,
    },
    /// This index entry has been removed.
    #[error("AssetIndex {index:?} has been removed")]
    Removed { index: AssetIndex },
}

#[cfg(test)]
mod test {
    use crate::tests::create_app;
    use crate::{Asset, AssetApp, AssetEvent, AssetIndex, Assets};
    use bevy_ecs::prelude::Messages;
    use bevy_reflect::TypePath;

    #[test]
    fn asset_index_round_trip() {
        let asset_index = AssetIndex {
            generation: 42,
            index: 1337,
        };
        let roundtripped = AssetIndex::from_bits(asset_index.to_bits());
        assert_eq!(asset_index, roundtripped);

View on GitHub (pinned to 396ca72708)

Solutions

1. Drop or stop using handles that reference the removed index
2. Re-load or re-create the asset to obtain a new valid index/handle
3. Avoid manually constructing AssetIndex values; use handles returned by the Assets<T> API

When it happens

Trigger: Thrown at crates/bevy_asset/src/assets.rs:743 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of bevyengine/bevy@396ca72708 (2026-08-20). Data as JSON: /api/errors/e4042ca57ac7ec20. Report an issue: GitHub.