diff --git a/model/MongoStatement.php b/model/MongoStatement.php
index da353ee..0a94548 100644
--- a/model/MongoStatement.php
+++ b/model/MongoStatement.php
@@ -55,7 +55,7 @@ class MongoStatement extends DbStatement
 
     public function close()
     {
-        // TODO: Implement close() method.
+        $this->result = null;
     }
 
     /**