From 522d2dc465b1a8c0cfddeceda225f34220fa1435 Mon Sep 17 00:00:00 2001
From: Vanessa <lly219@gmail.com>
Date: Wed, 10 Aug 2022 11:28:57 +0800
Subject: [PATCH] :bug:

---
 app/src/util/backForward.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/app/src/util/backForward.ts b/app/src/util/backForward.ts
index a34ef4108..4bf99c63f 100644
--- a/app/src/util/backForward.ts
+++ b/app/src/util/backForward.ts
@@ -254,7 +254,7 @@ export const pushBack = (protyle: IProtyle, range?: Range, blockElement?: Elemen
     if (!protyle.model) {
         return;
     }
-    if (!blockElement) {
+    if (!blockElement && range) {
         blockElement = hasClosestBlock(range.startContainer) as Element;
     }
     if (!blockElement) {