diff --git a/components/lib/sidebar/SidebarBase.js b/components/lib/sidebar/SidebarBase.js
index ee62578c75..4077f4fd3f 100644
--- a/components/lib/sidebar/SidebarBase.js
+++ b/components/lib/sidebar/SidebarBase.js
@@ -264,6 +264,7 @@ export const SidebarBase = ComponentBase.extend({
         id: null,
         style: null,
         className: null,
+        content: null,
         maskStyle: null,
         maskClassName: null,
         visible: false,