From eea65654721aa61fdc6ab2ae21a128b86e810942 Mon Sep 17 00:00:00 2001
From: balibabu <cike8899@users.noreply.github.com>
Date: Fri, 2 Aug 2024 11:22:10 +0800
Subject: [PATCH] fix: TypeError: Cannot read properties of undefined (reading
 'viewport' #1761 (#1784)

### What problem does this PR solve?

fix: TypeError: Cannot read properties of undefined (reading 'viewport'
#1761

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)
---
 .../knowledge-chunk/components/document-preview/preview.tsx     | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/web/src/pages/add-knowledge/components/knowledge-chunk/components/document-preview/preview.tsx b/web/src/pages/add-knowledge/components/knowledge-chunk/components/document-preview/preview.tsx
index b8409c1b4..54b204602 100644
--- a/web/src/pages/add-knowledge/components/knowledge-chunk/components/document-preview/preview.tsx
+++ b/web/src/pages/add-knowledge/components/knowledge-chunk/components/document-preview/preview.tsx
@@ -41,7 +41,7 @@ const Preview = ({ highlights: state, setWidthAndHeight }: IProps) => {
 
   useEffect(() => {
     if (state.length > 0) {
-      ref.current(state[0]);
+      ref?.current(state[0]);
     }
   }, [state]);