diff --git a/app/Services/ParkingLicensePlateService.php b/app/Services/ParkingLicensePlateService.php
index 37fddbf..84c9f90 100644
--- a/app/Services/ParkingLicensePlateService.php
+++ b/app/Services/ParkingLicensePlateService.php
@@ -176,6 +176,9 @@ class ParkingLicensePlateService
 
     public function createLicenseId($number, $space_type_id = 0)
     {
+        if (strlen($number) > 20) {
+            return 0;
+        }
         $license_id = ParkingLicensePlate::getValueId($number);
         if (!$license_id) {
             if (!$space_type_id) {