diff --git a/templates/element/variables_panel.php b/templates/element/variables_panel.php
index 986eea5a..63c152ad 100644
--- a/templates/element/variables_panel.php
+++ b/templates/element/variables_panel.php
@@ -14,7 +14,7 @@
 /**
  * @var \DebugKit\View\AjaxView $this
  * @var string $error
- * @var bool $sort
+ * @var bool|null $sort
  * @var array $variables
  * @var array $content
  * @var array $errors
@@ -62,7 +62,7 @@ class="js-debugkit-sort-variables"
             </label>
         </div>
         <?php
-        $this->Toolbar->setSort($sort);
+        $this->Toolbar->setSort($sort ?? false);
         echo $this->Toolbar->dumpNodes($variables);
     endif;