From 0945e87b6da1db95cf94b0cdd92db5456657de61 Mon Sep 17 00:00:00 2001
From: F0Rt04ka <rmn.2007@mail.ru>
Date: Sat, 23 May 2020 17:51:48 +0700
Subject: [PATCH] Fix "Undefined offset" if border style is "none" (#1423)

---
 src/PhpSpreadsheet/Reader/Html.php | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/PhpSpreadsheet/Reader/Html.php b/src/PhpSpreadsheet/Reader/Html.php
index 5e12a2fb..2fe85b6f 100644
--- a/src/PhpSpreadsheet/Reader/Html.php
+++ b/src/PhpSpreadsheet/Reader/Html.php
@@ -933,7 +933,12 @@ class Html extends BaseReader
      */
     private function setBorderStyle(Style $cellStyle, $styleValue, $type): void
     {
-        [, $borderStyle, $color] = explode(' ', $styleValue);
+        if (trim($styleValue) === Border::BORDER_NONE) {
+            $borderStyle = Border::BORDER_NONE;
+            $color = null;
+        } else {
+            [, $borderStyle, $color] = explode(' ', $styleValue);
+        }
 
         $cellStyle->applyFromArray([
             'borders' => [