From 33fce34bd894e0c66c20eee5d963e7585b9567f5 Mon Sep 17 00:00:00 2001
From: Manav Sarkar <manavsarkar07@gmail.com>
Date: Tue, 27 Dec 2022 15:57:33 +0530
Subject: [PATCH] add check for null when removing event listener

---
 packages/app-desktop/gui/PdfViewer.tsx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/app-desktop/gui/PdfViewer.tsx b/packages/app-desktop/gui/PdfViewer.tsx
index 39e671453ee..e6eeea3c0a1 100644
--- a/packages/app-desktop/gui/PdfViewer.tsx
+++ b/packages/app-desktop/gui/PdfViewer.tsx
@@ -83,7 +83,7 @@ export default function PdfViewer(props: Props) {
 		const iframe = iframeRef.current;
 		iframe.contentWindow.addEventListener('message', onMessage_);
 		return () => {
-			iframe.contentWindow.removeEventListener('message', onMessage_);
+			iframe?.contentWindow?.removeEventListener('message', onMessage_);
 		};
 	}, [onClose, openExternalViewer, textSelected]);