From 2291748a8334083bb087632d566873f96ccd96b2 Mon Sep 17 00:00:00 2001
From: MarkBaker <mark@lange.demon.co.uk>
Date: Thu, 14 Jul 2016 23:09:19 +0100
Subject: [PATCH] Fix for multiple worksheets, all with merge cells, in HTML
 Writer

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

diff --git a/src/PhpSpreadsheet/Writer/HTML.php b/src/PhpSpreadsheet/Writer/HTML.php
index 44eb5e02..5c87b3a4 100644
--- a/src/PhpSpreadsheet/Writer/HTML.php
+++ b/src/PhpSpreadsheet/Writer/HTML.php
@@ -405,7 +405,7 @@ class HTML extends BaseWriter implements IWriter
         }
 
         // Ensure that Spans have been calculated?
-        if (!$this->spansAreCalculated) {
+        if ($this->sheetIndex !== null || !$this->spansAreCalculated) {
             $this->calculateSpans();
         }