diff --git a/simple-mind-map/src/plugins/Drag.js b/simple-mind-map/src/plugins/Drag.js
index 28a8b354..fd99c5bf 100644
--- a/simple-mind-map/src/plugins/Drag.js
+++ b/simple-mind-map/src/plugins/Drag.js
@@ -204,7 +204,7 @@ class Drag extends Base {
 
   //  检测重叠节点
   checkOverlapNode() {
-    if (!this.drawTransform) {
+    if (!this.drawTransform || !this.placeholder) {
       return
     }
     const { nodeDragPlaceholderMaxSize } = this.mindMap.opt