diff --git a/ui/public/index.php b/ui/public/index.php
index 71055da..7ef5588 100644
--- a/ui/public/index.php
+++ b/ui/public/index.php
@@ -8,7 +8,9 @@ Monolog\ErrorHandler::register($app->getContainer()->get(Psr\Log\LoggerInterface
 try {
     $app->run();
 } catch (Error | Exception $e) {
-    $app->getContainer()->get(Psr\Log\LoggerInterface::class)->debug(json_encode(compact('_REQUEST')));
+    if (isset($_REQUEST)) {
+        $app->getContainer()->get(Psr\Log\LoggerInterface::class)->debug(json_encode(compact('_REQUEST')));
+    }
     $app->getContainer()->get(Psr\Log\LoggerInterface::class)->error($e);
     throw $e;
 }