diff --git a/include/renderer.php b/include/renderer.php
index 459e1c9..abb9fd9 100644
--- a/include/renderer.php
+++ b/include/renderer.php
@@ -107,7 +107,7 @@ class Renderer {
     }
     
     public function render(): void {
-        if (trim(filter_input(INPUT_POST, 'action', FILTER_SANITIZE_FULL_SPECIAL_CHARS)) !== '') {
+        if (filter_input(INPUT_POST, 'action', FILTER_SANITIZE_FULL_SPECIAL_CHARS) !== NULL && trim(filter_input(INPUT_POST, 'action', FILTER_SANITIZE_FULL_SPECIAL_CHARS)) !== '') {
             $this->formAction();
         }
         $this->website = file_get_contents('templates/page.html');