diff --git a/Resources/DelegatesToResource.php b/Resources/DelegatesToResource.php
index 04fd4372..72a1d7de 100644
--- a/Resources/DelegatesToResource.php
+++ b/Resources/DelegatesToResource.php
@@ -50,7 +50,7 @@ public function resolveRouteBinding($value)
      */
     public function offsetExists($offset)
     {
-        return array_key_exists($offset, $this->resource);
+        return isset($this->resource);
     }
 
     /**