diff --git a/src/Objects/WordPressObject.php b/src/Objects/WordPressObject.php
index 06aeb95..b049f50 100644
--- a/src/Objects/WordPressObject.php
+++ b/src/Objects/WordPressObject.php
@@ -40,4 +40,9 @@ public function __get(string $key): mixed
     {
         return $this->_map[$key] ?? null;
     }
+
+    public function __isset(string $key): bool
+    {
+        return isset($this->_map[$key]);
+    }
 }