diff --git a/src/Meta.php b/src/Meta.php
index a7148be..be78063 100644
--- a/src/Meta.php
+++ b/src/Meta.php
@@ -156,10 +156,12 @@ public static function render(?string $tag = null): string
 
         // register default tags on each request
         foreach (config('f9web-laravel-meta.defaults') as $key => $value) {
-            if (is_int($key)) {
-                self::setRawTag($value);
-            } else {
-                self::set($key, $value);
+            if (!Arr::has(self::$tags, $key)) {
+                if (is_int($key)) {
+                    self::setRawTag($value);
+                } else {
+                    self::set($key, $value);
+                }
             }
         }