From 3b81a50a1a445c919194fc73f9f5549198f74a09 Mon Sep 17 00:00:00 2001
From: Hennadii Chernyshchyk <genaloner@gmail.com>
Date: Fri, 15 Apr 2022 07:13:37 +0000
Subject: [PATCH] Fix crash in headless mode (#4476)

# Objective

Fixes #4440.

## Solution

Check if `RenderDevice` exists and add CI validation.
---
 .github/example-run/headless_defaults.ron | 3 +++
 crates/bevy_pbr/src/light.rs              | 7 ++++++-
 2 files changed, 9 insertions(+), 1 deletion(-)
 create mode 100644 .github/example-run/headless_defaults.ron

diff --git a/.github/example-run/headless_defaults.ron b/.github/example-run/headless_defaults.ron
new file mode 100644
index 0000000000..22e43495b5
--- /dev/null
+++ b/.github/example-run/headless_defaults.ron
@@ -0,0 +1,3 @@
+(
+    exit_after: Some(100)
+)
diff --git a/crates/bevy_pbr/src/light.rs b/crates/bevy_pbr/src/light.rs
index d05d5c44c5..0f67399e5e 100644
--- a/crates/bevy_pbr/src/light.rs
+++ b/crates/bevy_pbr/src/light.rs
@@ -642,8 +642,13 @@ pub(crate) fn assign_lights_to_clusters(
     lights_query: Query<(Entity, &GlobalTransform, &PointLight, &Visibility)>,
     mut lights: Local<Vec<PointLightAssignmentData>>,
     mut max_point_lights_warning_emitted: Local<bool>,
-    render_device: Res<RenderDevice>,
+    render_device: Option<Res<RenderDevice>>,
 ) {
+    let render_device = match render_device {
+        Some(render_device) => render_device,
+        None => return,
+    };
+
     global_lights.entities.clear();
     lights.clear();
     // collect just the relevant light query data into a persisted vec to avoid reallocating each frame