diff --git a/src/Resources/views/Exception/error.html.twig b/src/Resources/views/Exception/error.html.twig
index d5539d65..ae623860 100644
--- a/src/Resources/views/Exception/error.html.twig
+++ b/src/Resources/views/Exception/error.html.twig
@@ -13,7 +13,7 @@
             We will fix it as soon as possible. Sorry for any inconvenience caused.
         </p>
 
-        {% if best_matches not is empty %}
+        {% if best_matches is not empty %}
             <h3>Suggested pages</h3>
 
             {% for group, matches in best_matches %}