diff --git a/classes/Tools.php b/classes/Tools.php
index 11eb2f07ab579..f0210fa3f970c 100644
--- a/classes/Tools.php
+++ b/classes/Tools.php
@@ -1770,7 +1770,9 @@ public static function ps_round($value, $precision = 0, $round_mode = null)
     public static function math_round($value, $places, $mode = PS_ROUND_HALF_UP)
     {
         // since php 8.1 the round function won't tolerate null values
-        $value = $value ?? 0.0;
+        if ($value === null) {
+            $value = 0.0;
+        }
 
         //If PHP_ROUND_HALF_UP exist (PHP 5.3) use it and pass correct mode value (PrestaShop define - 1)
         if (defined('PHP_ROUND_HALF_UP')) {