diff --git a/lizmap/modules/lizmap/classes/lizmapTiler.class.php b/lizmap/modules/lizmap/classes/lizmapTiler.class.php
index cd2c7c4ea3..e926842a8f 100644
--- a/lizmap/modules/lizmap/classes/lizmapTiler.class.php
+++ b/lizmap/modules/lizmap/classes/lizmapTiler.class.php
@@ -603,7 +603,7 @@ public static function getTileBbox($tileMatrixSet, $tileMatrixId, $tileRow, $til
     private static function normalizeProjectScales($project)
     {
         $scales = array_merge(array(), $project->getOption('mapScales'));
-        if (reset($scales) == 0) {
+        if ($scales[0] == 0) {
             $scales[0] = 1;
             trigger_error('The minimum scale cannot have a value of 0, redefined as 1.', E_USER_NOTICE);
         }