WARN bevy_egui::egui_node: Failed to retrieve egui node data!

[francisdb]

I'm getting this logged about 8 times during application startup when adding the EguiPlugin to my project.

2025-03-02T09:40:11.512451Z  WARN bevy_egui::egui_node: Failed to retrieve egui node data!

Seems to originate from here:

bevy_egui/src/egui_node.rs

Line 237 in 0a81f6b

bevy_log::warn!("Failed to retrieve egui node data!");

Am I doing something wrong or is this expected?

• Ubuntu Linux 24.10 Gnome
• Wayland (bevy running under xwayland)
• Latest bevy and bevy-egui versions

[vladbat00]

Hi! I'm not yet sure what might be causing this. Do you see the same warning if you start any bevy_egui example?

If so, what platform are you using? Windows, MacOS, some Linux desktop environment?

If the bevy_egui examples run without the warning, could you help me with a minimal example to reproduce it?

[francisdb]

Thanks for the quick reply. Added system info in the description. Will have a look at the example.

[francisdb]

Found something, the only example that has this log line is the multi-window one. And I have many windows in my app so this probably gets logged for each extra window?

➜  bevy_egui git:(main) cargo run --example two_windows     
   Compiling bevy_egui v0.33.0 (xxx/bevy_egui)
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 8.28s
     Running `target/debug/examples/two_windows`
2025-03-02T10:13:13.337964Z  INFO bevy_render::renderer: AdapterInfo { name: "AMD Radeon RX 7600 (RADV NAVI33)", vendor: 4098, device: 29824, device_type: DiscreteGpu, driver: "radv", driver_info: "Mesa 24.2.8-1ubuntu1~24.10.1", backend: Vulkan }
2025-03-02T10:13:13.700856Z  INFO bevy_winit::system: Creating new window "App" (0v1#4294967296)
2025-03-02T10:13:13.700934Z  INFO winit::platform_impl::linux::x11::window: Guessed window scale factor: 2
2025-03-02T10:13:13.943946Z  WARN bevy_egui::egui_node: Failed to retrieve egui node data!
2025-03-02T10:13:13.947147Z  INFO bevy_winit::system: Creating new window "Second window" (6v1#4294967302)
2025-03-02T10:13:13.947215Z  INFO winit::platform_impl::linux::x11::window: Guessed window scale factor: 2

[vladbat00]

Aha, I see. That makes sense, and I also can reproduce it on my macbook. This is definitely a bevy_egui issue, nothing you're doing wrong on your end!

I can see we have some weird ordering, where we run the prepare_egui_render_target_data system (which creates render data) after EguiNode::update. I'll think on how to fix it.
It shouldn't be a problem for apps really, but this is ofc not ideal.