diff --git a/src/HelpersServiceProvider.php b/src/HelpersServiceProvider.php
index 7fd7559d..b92cfd55 100755
--- a/src/HelpersServiceProvider.php
+++ b/src/HelpersServiceProvider.php
@@ -8,6 +8,7 @@
 use Illuminate\Support\Facades\Validator;
 use Maatwebsite\Excel\ExcelServiceProvider;
 use RonasIT\Support\Middleware\SecurityMiddleware;
+use Illuminate\Support\Arr;
 
 class HelpersServiceProvider extends ServiceProvider
 {
@@ -18,11 +19,17 @@ public function boot()
         $router->prependMiddlewareToGroup('web', SecurityMiddleware::class);
         $router->prependMiddlewareToGroup('api', SecurityMiddleware::class);
 
-        Validator::extend('unique_except_of_authorized_user', function ($attribute, $value) {
+        validator::extend('unique_except_of_authorized_user', function ($attribute, $value, $parameters = []) {
+            $table = Arr::get($parameters, 0, 'users');
+            $keyField = Arr::get($parameters, 1, 'id');
             $userId = app(JWTAuth::class)->toUser()->id;
-            $result = DB::select("select count(*) as entities_count from users where id <> {$userId} and {$attribute} = '{$value}';");
 
-            return $result[0]->entities_count == 0;
+            $result = DB::table($table)
+                ->where($keyField, '<>', $userId)
+                ->whereIn($attribute, Arr::flatten((array) $value))
+                ->exists();
+
+            return !$result;
         });
 
         app(ExcelServiceProvider::class, ['app' => app()])->boot();