diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 8eaee31..2e9c0c7 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -28,7 +28,7 @@ jobs:
           php-version: ${{matrix.php}}
           tools: phpunit, composer
       - run: composer install --no-interaction
-      - run: ./vendor/bin/phpunit --migrate-configuration
+      - run: ./vendor/bin/phpunit
   ruby:
     strategy:
       matrix:
diff --git a/src/Validator.php b/src/Validator.php
index 969b060..18538a1 100644
--- a/src/Validator.php
+++ b/src/Validator.php
@@ -43,13 +43,13 @@ class Validator {
       preg_match_all($regex, $address, $matches);
 
       $results = array_reduce($matches, function($res, $match) {
-        if ($match[0] and in_array($match[0], $res, true) === false){
+        if (isset($match[0]) and in_array($match[0], $res, true) === false){
           $res[] = $match[0];
         }
         return $res;
       }, $results);
     }
 
-    return $results;
+    return array_values($results);
   }
 }