Despawn_recursive entity not found error

[Lyndon-Mackay]

Hi,

I have a race condition with despawning causing me some issues.

Currently I have a UI for building which has a node bundle that contains buildings under construction (construction node bundle) when it is done I despawn it.

I also despawn my UI when the user presses enter.

Part of the UI does include that construction node bundle, so if I despawn the entire UI I want to also despawn then construction node bundle.

With this in mind if I press enter at the wrong time then I will crash with an entity not found error which is (I believe ) caused by the despawn_recursive calls being used on the same entity.

A potential solution I am thinking of is to make an event and an event handler to solve this by checking if it exists then calling despawn_recursive (I don't care if the entity doesn't exist in this case it just means job done).

I am not sure if panicking is the intended behaviour as briefly looking at top level code on
Entity commands checks against panicking on top level entity if its an error to panic on top level why is it an error to panic on a missing child (Which I assume is when its panicking).

2024-09-23T01:10:24.699441Z  WARN bevy_ecs::world: error[B0003]: Could not despawn entity Entity { index: 91, generation: 37 } because it doesn't exist in this World. See: https://bevyengine.org/learn/errors/#b0003
   at /home/lyndonm/.cargo/registry/src/index.crates.io-6f17d22bba15001f/bevy_ecs-0.14.2/src/world/mod.rs:1108

[Lyndon-Mackay]

This might be my answer #5617 (comment)