From 1076d5a65357102d0fcd99f35ae2303a1993e9ba Mon Sep 17 00:00:00 2001
From: openclaw-agent <agent@pascal.app>
Date: Thu, 4 Jun 2026 04:10:04 +0000
Subject: [PATCH] fix(wall-tool): null-guard wallPreviewRef writes in
 onGridClick / onGridMove

Sentry MONOREPO-EDITOR-D0: when the wall tool unmounts mid-click
(level switch / tool change), the emitter listener can fire after
the mesh is removed from R3F, leaving wallPreviewRef.current null.
Match the guard style at line 407.
---
 packages/nodes/src/wall/tool.tsx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/nodes/src/wall/tool.tsx b/packages/nodes/src/wall/tool.tsx
index 530472ec1..7b2e0c9c6 100644
--- a/packages/nodes/src/wall/tool.tsx
+++ b/packages/nodes/src/wall/tool.tsx
@@ -542,7 +542,7 @@ export const WallTool: React.FC = () => {
         // BoxGeometry stays visible for a frame on top of the
         // freshly-committed real wall, producing a brief
         // double-paint at the new wall's position.
-        wallPreviewRef.current.visible = false
+        if (wallPreviewRef.current) wallPreviewRef.current.visible = false
         setDraftMeasurement(null)
       }
     }