From feddc436db2aa91570d397dc8f8733ab75ec3c07 Mon Sep 17 00:00:00 2001
From: Wenzel Jonas <wenzel.jonas@huckleberry-friends.de>
Date: Wed, 15 Nov 2023 13:41:26 +0100
Subject: [PATCH] Fix issue #1312

TypeError: Cannot read properties of null (reading 'previousElementSibling')
---
 src/lib/core.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/lib/core.js b/src/lib/core.js
index 0bdc4547..af857b54 100755
--- a/src/lib/core.js
+++ b/src/lib/core.js
@@ -2143,7 +2143,9 @@ export default function (context, pluginCallButtons, plugins, lang, options, _re
             let endNextEl = null;
             if (isStartEdge) {
                 startPrevEl = util.getFormatElement(range.startContainer);
-                prevContainer = startPrevEl.previousElementSibling;
+                if (startPrevEl) {
+                	prevContainer = startPrevEl.previousElementSibling;
+                }
                 startPrevEl = startPrevEl ? prevContainer : startPrevEl;
             }
             if (isEndEdge) {