diff --git a/simple-mind-map/src/Node.js b/simple-mind-map/src/Node.js
index 9821b329..528f1635 100644
--- a/simple-mind-map/src/Node.js
+++ b/simple-mind-map/src/Node.js
@@ -560,7 +560,7 @@ class Node {
     this.hideGeneralization()
     if (this.parent) {
       let index = this.parent.children.indexOf(this)
-      this.parent._lines[index].hide()
+      this.parent._lines[index] && this.parent._lines[index].hide()
       this._lines.forEach(item => {
         item.hide()
       })