diff --git a/packages/ringcentral-widgets/components/ConversationPanel/index.js b/packages/ringcentral-widgets/components/ConversationPanel/index.js
index 3e945940bc..25447af005 100644
--- a/packages/ringcentral-widgets/components/ConversationPanel/index.js
+++ b/packages/ringcentral-widgets/components/ConversationPanel/index.js
@@ -334,7 +334,7 @@ ConversationPanel.defaultProps = {
   messageSubjectRenderer: undefined,
   perPage: undefined,
   loadConversation: () => null,
-  renderExtraButton: () => null,
+  renderExtraButton: undefined,
   loadingNextPage: false
 };