From 34d70afadf8859fa5ed58928a028141f4f4d41fb Mon Sep 17 00:00:00 2001
From: Rich Evans <rcb.evans@outlook.com>
Date: Thu, 23 Feb 2023 12:44:20 -0800
Subject: [PATCH] fix: deleteText currPos left and right both null

Handle the case where both `currPos.left` and `currPos.right` are null in `YText::deleteText` to prevent error `Cannot read properties of null (reading 'parent')` .

Fixes https://github.com/yjs/yjs/issues/504.
---
 src/types/YText.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/types/YText.js b/src/types/YText.js
index d1cdf781..71d6a030 100644
--- a/src/types/YText.js
+++ b/src/types/YText.js
@@ -498,8 +498,8 @@ const deleteText = (transaction, currPos, length) => {
   if (start) {
     cleanupFormattingGap(transaction, start, currPos.right, startAttrs, currPos.currentAttributes)
   }
-  const parent = /** @type {AbstractType<any>} */ (/** @type {Item} */ (currPos.left || currPos.right).parent)
-  if (parent._searchMarker) {
+  const parent = /** @type {AbstractType<any>} */ (/** @type {Item} */ (currPos.left || currPos.right)?.parent)
+  if (parent?._searchMarker) {
     updateMarkerChanges(parent._searchMarker, currPos.index, -startLength + length)
   }
   return currPos