From b90f32f55af68f447f5b3a6f0b44990b5c23dd67 Mon Sep 17 00:00:00 2001
From: Mike Hsu <mike.hsu@gmail.com>
Date: Sun, 5 Feb 2023 20:02:59 -0800
Subject: [PATCH] early return from multithreaded executor

---
 crates/bevy_ecs/src/schedule/executor/multi_threaded.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/crates/bevy_ecs/src/schedule/executor/multi_threaded.rs b/crates/bevy_ecs/src/schedule/executor/multi_threaded.rs
index 258360a07a1b4..16ab5f789675d 100644
--- a/crates/bevy_ecs/src/schedule/executor/multi_threaded.rs
+++ b/crates/bevy_ecs/src/schedule/executor/multi_threaded.rs
@@ -145,6 +145,9 @@ impl SystemExecutor for MultiThreadedExecutor {
     fn run(&mut self, schedule: &mut SystemSchedule, world: &mut World) {
         // reset counts
         let num_systems = schedule.systems.len();
+        if num_systems == 0 {
+            return;
+        }
         self.num_running_systems = 0;
         self.num_completed_systems = 0;
         self.num_dependencies_remaining.clear();