diff --git a/js/term/demo.js b/js/term/demo.js
index 098577d..f321911 100644
--- a/js/term/demo.js
+++ b/js/term/demo.js
@@ -838,7 +838,7 @@ let demoshIndex = {
     destroy () {
       if (this.didDestroy) return
       this.didDestroy = true
-      this.child.destroy()
+      if (this.child) this.child.destroy()
       super.destroy()
     }
   },