diff --git a/src/Extension/BetterNavigatorExtension.php b/src/Extension/BetterNavigatorExtension.php
index a68f88e..1297618 100644
--- a/src/Extension/BetterNavigatorExtension.php
+++ b/src/Extension/BetterNavigatorExtension.php
@@ -50,6 +50,10 @@ class BetterNavigatorExtension extends DataExtension
             return $result;
         }
 
+        if (!($result instanceof DBHTMLText)) {
+            return $result;
+        }
+
         $html = $result->getValue();
         $navigatorHTML = $this->generateNavigator()->getValue();