Despawn a MultibodyJoint

[KnstAnt]

How can i remove a body with contains MultibodyJoint without causing a panic? I tried some ways, simple despawn and removing components as joints and colliders. I get panic after despawn anyway.

[ThierryBerger]

hey, Sorry to hear you're encountering panics ; a minimal reproduction of your usage and backtrace would help with helping you.

[KnstAnt]

Hi. Thanks you for interesting to my problem. Here is the simple project for reproduction: https://github.com/KnstAnt/test_rapier.git

backtrace:
Running target\debug\test_rapier.exe
2025-06-22T13:54:02.167395Z INFO bevy_diagnostic::system_information_diagnostics_plugin::internal: SystemInfo { os: "Windows 10 Pro", kernel: "19045", cpu: "Intel(R) Xeon(R) CPU E5-2673 v4 @ 2.30GHz", core_count: "20", memory: "31.8 GiB" }
2025-06-22T13:54:03.277223Z INFO bevy_render::renderer: AdapterInfo { name: "NVIDIA GeForce RTX 4080", vendor: 4318, device: 9988, device_type: DiscreteGpu, driver: "NVIDIA", driver_info: "551.23", backend: Vulkan }
2025-06-22T13:54:04.965926Z INFO bevy_render::batching::gpu_preprocessing: GPU preprocessing is fully supported on this device.
2025-06-22T13:54:05.071213Z INFO bevy_winit::system: Creating new window App (0v1)

thread 'Compute Task Pool (19)' panicked at S:\myProgr\rust\cargo\registry\src\index.crates.io-1949cf8c6b5b557f\rapier3d-0.25.1\src\dynamics\joint\multibody_joint\multd-0.25.1\src\dynamics\joint\multibody_joint\multibody_joint_set.rs:220:74:
called Option::unwrap() on a None value
note: run with RUST_BACKTRACE=1 environment variable to display a backtrace
Encountered a panic in system bevy_rapier3d::plugin::systems::remove::sync_removals!

thread 'Compute Task Pool (29)' panicked at S:\myProgr\rust\cargo\registry\src\index.crates.io-1949cf8c6b5b557f\rapier3d-0.25.1\src\dynamics\joint\multibody_joint\multd-0.25.1\src\dynamics\joint\multibody_joint\multibody_joint_set.rs:128:43:
No element at index
Encountered a panic in system bevy_rapier3d::render::debug_render_scene!
Encountered a panic in system bevy_app::main_schedule::Main::run_main!
error: process didn't exit successfully: target\debug\test_rapier.exe (exit code: 101)