From 6dd1298b089e507df6f3af57f9301fd1d806cd76 Mon Sep 17 00:00:00 2001
From: ChenX <maple6@vip.qq.com>
Date: Mon, 21 Jun 2021 16:14:06 +0800
Subject: [PATCH] =?UTF-8?q?=E5=BC=80=E5=8F=91:=E9=81=BF=E5=85=8D=E9=94=99?=
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---
 src/Add-on/DrawDim/DimArc.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/Add-on/DrawDim/DimArc.ts b/src/Add-on/DrawDim/DimArc.ts
index c47b17ef9..a0404a57d 100644
--- a/src/Add-on/DrawDim/DimArc.ts
+++ b/src/Add-on/DrawDim/DimArc.ts
@@ -11,7 +11,8 @@ import { HotCMD } from "../../Hot/HotCommand";
 
 function GetBoardCurve(ent: Board): Arc | undefined
 {
-    return GetPolylineArc(ent.ContourCurve.Clone().ApplyMatrix(ent.OCSNoClone) as Polyline);
+    if (ent.ContourCurve instanceof Polyline)
+        return GetPolylineArc(ent.ContourCurve.Clone().ApplyMatrix(ent.OCSNoClone) as Polyline);
 }
 
 function GetPolylineArc(cu: Polyline)