fix for #6

Author: aivaonair

src/Parameters/Traits/GeneratesFromRules.php

@@ -74,7 +74,7 @@ protected function getParameterExtra(string $type, array $parameterRules): array
 
         if ($type == 'string') {
             foreach ($parameterRules as $rule) {
-                if(is_object($rule)) continue;
+                if (!is_string($rule)) continue;
                 if (Str::startsWith($rule, 'min')) {
                     [$_, $value] = explode(':', $rule);
                     $extra['minLength'] = intval(trim($value));