diff --git a/src/components/Roof2.jsx b/src/components/Roof2.jsx
index 70deec93..f77f68c0 100644
--- a/src/components/Roof2.jsx
+++ b/src/components/Roof2.jsx
@@ -594,13 +594,12 @@ export default function Roof2(props) {
   }
 
   const changeLength = (e) => {
-    setScale(e)
     const polygon = canvas?.getActiveObject()
 
-    if (polygon.type !== 'QPolygon') {
+    if (polygon?.type !== 'QPolygon') {
       return
     }
-
+    setScale(e)
     polygon.setScaleX(e)
 
     canvas?.renderAll()