diff --git a/src/app/Extensions/TwigFunctions.php b/src/app/Extensions/TwigFunctions.php
index 03e727d..555cefc 100644
--- a/src/app/Extensions/TwigFunctions.php
+++ b/src/app/Extensions/TwigFunctions.php
@@ -13,6 +13,7 @@ class TwigFunctions extends AbstractExtension
     {
         return [
             new TwigFunction('config', [$this, 'config']),
+            new TwigFunction('is_file', [$this, 'is_file']),
             new TwigFunction('base_url', [$this, 'base_url']),
         ];
     }
@@ -26,4 +27,9 @@ class TwigFunctions extends AbstractExtension
     {
         return base_url($path);
     }
+
+    public function is_file(string $path): bool
+    {
+        return is_file($path);
+    }
 }
diff --git a/src/views/layouts/default.twig b/src/views/layouts/default.twig
index 25e36c5..b1833d6 100644
--- a/src/views/layouts/default.twig
+++ b/src/views/layouts/default.twig
@@ -65,6 +65,8 @@
                 href="https://axenov.dev">axenov.dev</a>
         </footer>
     </div>
-    {% include "custom/custom.twig" %}
+    {% if is_file("custom/custom.twig") %}
+        {% include "custom/custom.twig" %}
+    {% endif %}
 </body>
 </html>