1

vendor/phpoffice/phpexcel/Classes/PHPExcel/Calculation/Functions.php

@@ -558,7 +558,7 @@ class PHPExcel_Calculation_Functions
                 return (integer) $value;
             case 'string':
                 //    Errors
-                if ((strlen($value) > 0) && ($value{0} == '#')) {
+                if ((strlen($value) > 0) && ($value[0] == '#')) {
                     return $value;
                 }
                 break;