From 36c11ee48245079fcfaabaea68258e55e80cb55d Mon Sep 17 00:00:00 2001
From: Brecht Van Lommel <brecht@blender.org>
Date: Thu, 29 Feb 2024 17:28:13 +0100
Subject: [PATCH] Fix #118514: Cycles MetalRT crash with empty scene

Pull Request: https://projects.blender.org/blender/blender/pulls/118907
---
 intern/cycles/device/metal/queue.mm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/intern/cycles/device/metal/queue.mm b/intern/cycles/device/metal/queue.mm
index 2fc65acd289..b6f3cd26c3c 100644
--- a/intern/cycles/device/metal/queue.mm
+++ b/intern/cycles/device/metal/queue.mm
@@ -523,7 +523,7 @@ bool MetalDeviceQueue::enqueue(DeviceKernel kernel,
             break;
         }
 
-        if (bvhMetalRT) {
+        if (bvhMetalRT && bvhMetalRT->accel_struct) {
           /* Mark all Accelerations resources as used */
           [mtlComputeCommandEncoder useResource:bvhMetalRT->accel_struct
                                           usage:MTLResourceUsageRead];