diff --git a/src/hooks/usePolygon.js b/src/hooks/usePolygon.js
index 3a5c88f5..4a8ecfdc 100644
--- a/src/hooks/usePolygon.js
+++ b/src/hooks/usePolygon.js
@@ -268,7 +268,7 @@ export const usePolygon = () => {
       surfaceCompass: polygon.surfaceCompass,
       moduleCompass: polygon.moduleCompass,
       visible: isFlowDisplay,
-      pitch: polygon.roofMaterial.pitch ?? 4,
+      pitch: polygon.roofMaterial?.pitch ?? 4,
       parentId: polygon.id,
     })