From 3fc2fa47de62dd2e2b8e6f2d23a4d3e3c9db316f Mon Sep 17 00:00:00 2001
From: Dennis Holst <dholst@rapidsoft.de>
Date: Tue, 12 Nov 2019 14:09:10 +0100
Subject: [PATCH] Check for existing xf index in mapping array before accessing
 it

---
 src/PhpSpreadsheet/Reader/Xls.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/PhpSpreadsheet/Reader/Xls.php b/src/PhpSpreadsheet/Reader/Xls.php
index b10df595..313d7216 100644
--- a/src/PhpSpreadsheet/Reader/Xls.php
+++ b/src/PhpSpreadsheet/Reader/Xls.php
@@ -3825,7 +3825,7 @@ class Xls extends BaseReader
                 }
             }
 
-            if (!$this->readDataOnly && !$emptyCell) {
+            if (!$this->readDataOnly && !$emptyCell && isset($this->mapCellXfIndex[$xfIndex])) {
                 // add style information
                 $cell->setXfIndex($this->mapCellXfIndex[$xfIndex]);
             }