diff --git a/simple-mind-map/src/core/render/Render.js b/simple-mind-map/src/core/render/Render.js
index 9b997a68..fcf179cb 100644
--- a/simple-mind-map/src/core/render/Render.js
+++ b/simple-mind-map/src/core/render/Render.js
@@ -446,6 +446,7 @@ class Render {
           this.waitRenderingParams = []
           this.render(...params)
         } else {
+          this.renderSource = ''
           if (this.reRender) {
             this.reRender = false
           }