{"record":{"id":"2628167e0eac52ec","repo":"bevyengine/bevy","slug":"b0003","errorCode":"B0003","errorMessage":"error[B0003]: Could not insert a bundle (of type `{}`) for entity {first_entity} because: {err}. See: https://bevyengine.org/learn/errors/b0003","messagePattern":"error\\[B0003\\]: Could not insert a bundle \\(of type `(.+?)`\\) for entity (.+?) because: (.+?)\\. See: https://bevyengine\\.org/learn/errors/b0003","errorType":"panic","errorClass":null,"httpStatus":null,"severity":"error","filePath":"crates/bevy_ecs/src/world/mod.rs","lineNumber":2521,"sourceCode":"    ) where\n        I: IntoIterator,\n        I::IntoIter: Iterator<Item = (Entity, B)>,\n        B: Bundle<Effect: NoBundleEffect>,\n    {\n        struct InserterArchetypeCache<'w> {\n            inserter: BundleInserter<'w>,\n            archetype_id: ArchetypeId,\n        }\n\n        let change_tick = self.change_tick();\n        let bundle_id = self.register_bundle_info::<B>();\n\n        let mut batch_iter = batch.into_iter();\n\n        if let Some((first_entity, first_bundle)) = batch_iter.next() {\n            match self.entities().get_spawned(first_entity) {\n                Err(err) => {\n                    panic!(\"error[B0003]: Could not insert a bundle (of type `{}`) for entity {first_entity} because: {err}. See: https://bevyengine.org/learn/errors/b0003\", core::any::type_name::<B>());\n                }\n                Ok(first_location) => {\n                    let mut cache = InserterArchetypeCache {\n                        // SAFETY: we initialized this bundle_id in `register_info`\n                        inserter: unsafe {\n                            BundleInserter::new_with_id(\n                                self,\n                                first_location.archetype_id,\n                                bundle_id,\n                                change_tick,\n                            )\n                        },\n                        archetype_id: first_location.archetype_id,\n                    };\n                    move_as_ptr!(first_bundle);\n                    // SAFETY: `entity` is valid, `location` matches entity, bundle matches inserter, B::Effect: NoBundleEffect\n                    unsafe {\n                        cache.inserter.insert(","sourceCodeStart":2503,"sourceCodeEnd":2539,"githubUrl":"https://github.com/bevyengine/bevy/blob/396ca727080776bd313bb892423b7d94e03b81b4/crates/bevy_ecs/src/world/mod.rs#L2503-L2539","documentation":"This is Bevy error B0003, raised inside World::insert_batch_with_caller, which backs World::insert_batch and World::insert_batch_if_new. It panics when the FIRST entity of the batch cannot be resolved by Entities::get_spawned, i.e. the Entity id is not a currently spawned (alive) entity of this World. Because batch inserts skip per-entity error handling for speed, any dead or foreign id aborts with this error and a link to https://bevyengine.org/learn/errors/b0003.","triggerScenarios":"Passing an (Entity, Bundle) pair to world.insert_batch(...) / insert_batch_if_new(...) where the Entity was already despawned, was obtained from a different World (e.g. the render sub-world vs the main world), or is a stale id held across frames after the entity was deleted by another system.","commonSituations":"Buffering Entity ids in a Vec or event for later batch insertion while another system (or an observer / hook) despawns those entities in between; multi-world setups (extraction) mixing up main-world and sub-world Entity ids; commands deferred across a frame boundary so the target entity is gone by execution time.","solutions":["Switch to the fallible API world.try_insert_batch(batch) or try_insert_batch_if_new(batch) and handle the returned TryInsertBatchError.","Filter the batch before inserting: retain only entities for which world.entities().contains(e) (or get_spawned(e).is_ok()) is true.","Re-check ownership/lifecycle: stop holding Entity ids past the despawn point, or verify with world.get_entity_mut(e) before building the batch.","If ids come from another World, remap them (e.g. via the SubEntity/MainEntity mapping in bevy_extract) before batch-inserting."],"exampleFix":"// before\nworld.insert_batch(batch); // panics if any entity was despawned\n\n// after\nlet alive: Vec<(Entity, MyBundle)> = batch\n    .into_iter()\n    .filter(|(e, _)| world.entities().contains(*e))\n    .collect();\nworld.insert_batch(alive);\n\n// or use the fallible version:\nif let Err(e) = world.try_insert_batch(batch) {\n    warn!(\"batch insert skipped: {e}\");\n}","handlingStrategy":"validation","validationCode":"let batch: Vec<(Entity, B)> = batch\n    .into_iter()\n    .filter(|(e, _)| world.entities().contains(*e))\n    .collect();\nworld.insert_batch(batch);","typeGuard":null,"tryCatchPattern":"match world.try_insert_batch(batch) {\n    Ok(()) => {}\n    Err(TryInsertBatchError::EntityDoesNotExist(e)) => warn!(\"dead entity in batch: {e:?}\"),\n}","preventionTips":["Prefer try_insert_batch / try_insert_batch_if_new whenever entity lifetimes are not fully controlled.","Validate entity ids with world.entities().contains immediately before batch insertion, not at batch-construction time.","Never reuse Entity ids across Worlds; remap via MainEntity/SubEntity in extraction setups."],"tags":["bevy","ecs","b0003","insert-batch","entity","panic"],"backgroundTag":"entity-not-found","analyzedSha":"396ca727080776bd313bb892423b7d94e03b81b4","analyzedAt":"2026-08-20T16:12:39.808Z","schemaVersion":2},"datasetVersion":"2026-08-22T04:17:13.399Z"}