diff --git a/src/DatabaseServices/Entity/Polyline.ts b/src/DatabaseServices/Entity/Polyline.ts
index e78ac32e9..b1e891670 100644
--- a/src/DatabaseServices/Entity/Polyline.ts
+++ b/src/DatabaseServices/Entity/Polyline.ts
@@ -90,18 +90,19 @@ export class Polyline extends Curve
             pts.push(data.pt);
             buls.push(-data.bul);
         }
+
+        let lastBul = buls.pop();
         buls.reverse();
-        buls.push(buls[0])
-        buls.shift();
+        buls.push(lastBul);
 
         pts.reverse();
 
-        this._LineData.length = 0;
         for (let i = 0; i < pts.length; i++)
         {
-            this._LineData.push({ pt: pts[i], bul: buls[i] });
+            let d = this._LineData[i];
+            d.pt = pts[i];
+            d.bul = buls[i];
         }
-        this.Update();
 
         return this;
     }