From c2fefc924c3eb1549280f31f426a399f002d1da6 Mon Sep 17 00:00:00 2001
From: John Burns <jburns@localhost.localdomain>
Date: Sat, 20 Feb 2021 10:38:40 +0000
Subject: [PATCH] fix for #6841

---
 src/mixins/itext_behavior.mixin.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/mixins/itext_behavior.mixin.js b/src/mixins/itext_behavior.mixin.js
index c523578ebdb..4d075b4f4a4 100644
--- a/src/mixins/itext_behavior.mixin.js
+++ b/src/mixins/itext_behavior.mixin.js
@@ -866,7 +866,13 @@
           this.insertCharStyleObject(cursorLoc.lineIndex + i, 0, addedLines[i], copiedStyle);
         }
         else if (copiedStyle) {
-          this.styles[cursorLoc.lineIndex + i][0] = copiedStyle[0];
+          // this test is required in order to close #6841
+          // when a pasted buffer begins with a newline then
+          // this.styles[cursorLoc.lineIndex + i] and copiedStyle[0]
+          // may be undefined for some reason
+          if (this.styles[cursorLoc.lineIndex + i] && copiedStyle[0]) {
+            this.styles[cursorLoc.lineIndex + i][0] = copiedStyle[0];
+          }
         }
         copiedStyle = copiedStyle && copiedStyle.slice(addedLines[i] + 1);
       }