diff --git a/src/Add-on/DrawPolyline.ts b/src/Add-on/DrawPolyline.ts
index 0e61b3225..eb686291b 100644
--- a/src/Add-on/DrawPolyline.ts
+++ b/src/Add-on/DrawPolyline.ts
@@ -28,10 +28,10 @@ export class DrawPolyline
         let Callback = (p: Vector3) =>
             this.UpdatePoint(plJig, p)
 
-        let firstOps: GetPointPrompt = { Msg: "请输入第一个点:", Callback };
+        let firstOps: GetPointPrompt = { Msg: "请输入第一个点:", Callback, AllowNone: true };
         let keywords = [{ msg: "圆弧", key: "A" }, { msg: "直线", key: "L" }, { msg: "放弃", key: "U" }];
         let keywords2 = keywords.concat([{ msg: "闭合", key: "C" }]);
-        let nextOps: GetPointPrompt = { Msg: "请点击下一个点或", Callback };
+        let nextOps: GetPointPrompt = { Msg: "请点击下一个点或", Callback, AllowNone: true };
 
         while (true)
         {