diff --git a/e107_core/shortcodes/single/lan.php b/e107_core/shortcodes/single/lan.php
index a174f119b..21d9cc0ae 100644
--- a/e107_core/shortcodes/single/lan.php
+++ b/e107_core/shortcodes/single/lan.php
@@ -8,4 +8,8 @@ function lan_shortcode($parm = '')
 	{
 		return constant($lan);
 	}
+	elseif(ADMIN)
+	{
+		return "<span class='alert alert-danger'><strong>".$parm ."</strong> is undefined</span>"; // debug info
+	}
 }