diff --git a/index.php b/index.php
index 7c9cadc1e..92f11460d 100755
--- a/index.php
+++ b/index.php
@@ -188,7 +188,7 @@ echo ' required>
             });
             </script>';
 
-$custom_css = html_entity_decode(setting('CSS Personalizzato'));
+$custom_css = $dbo->isInstalled() ? html_entity_decode(setting('CSS Personalizzato')) : '';
 if (!empty($custom_css)) {
     echo '
     <style>'.$custom_css.'</style>';