fixed null conversation for strToUpper (#2292)

fixed in the same way as it already has been done for strToLower Co-authored-by: Adrien Crivelli <adrien.crivelli@gmail.com>
2021-11-01 03:45:21 +01:00 · 2021-11-01 03:45:21 +01:00 · 4c4ae2634f
parent 5ca5e3423d
commit 4c4ae2634f
1 changed files with 1 additions and 1 deletions
--- a/src/PhpSpreadsheet/Shared/StringHelper.php
+++ b/src/PhpSpreadsheet/Shared/StringHelper.php
@ -490,7 +490,7 @@ class StringHelper
     */
    public static function strToUpper($textValue)
    {
-        return mb_convert_case($textValue, MB_CASE_UPPER, 'UTF-8');
+        return mb_convert_case($textValue ?? '', MB_CASE_UPPER, 'UTF-8');
    }

    /**