From f42c3ef5a093571f22922c9e708896313e8109a2 Mon Sep 17 00:00:00 2001
From: oleibman <eclipsechasers2@yahoo.com>
Date: Sun, 31 May 2020 10:59:52 -0700
Subject: [PATCH] Update src/PhpSpreadsheet/Writer/Html.php

Co-authored-by: Adrien Crivelli <adrien.crivelli@gmail.com>
---
 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 1403d9be..fceec678 100644
--- a/src/PhpSpreadsheet/Writer/Html.php
+++ b/src/PhpSpreadsheet/Writer/Html.php
@@ -208,7 +208,7 @@ class Html extends BaseWriter
         return $html;
     }
 
-    public function setEditHtmlCallback(callable $cbk): void
+    public function setEditHtmlCallback(?callable $cbk): void
     {
         $this->editHtmlCallback = $cbk;
     }