diff --git a/src/jlgraphic/app/JlDrawApp.ts b/src/jlgraphic/app/JlDrawApp.ts
index cf49b2e..22151c0 100644
--- a/src/jlgraphic/app/JlDrawApp.ts
+++ b/src/jlgraphic/app/JlDrawApp.ts
@@ -102,7 +102,9 @@ export abstract class GraphicDrawAssistant<
   unbind(): void {
     this.clearCache();
     const canvas = this.canvas;
-    canvas.removeChild(this.container);
+    if (this.container?.parent) {
+      canvas.removeChild(this.container);
+    }
     canvas.off('mousedown', this.onLeftDown, this);
     canvas.off('mousemove', this.onMouseMove, this);
     canvas.off('mouseup', this.onLeftUp, this);