fix

src/Service/Utils/DateTimeConstraint.php

@@ -63,7 +63,7 @@ class DateTimeConstraint
      * @return bool
      */
     private function hasCustomPeriods($historical): bool{
-        return $historical['dateStart'] && $historical['dateEnd'];
+        return array_key_exists('dateStart', $historical) && $historical['dateStart'] && array_key_exists('dateEnd', $historical) && $historical['dateEnd'];
     }
 
     /**