diff --git a/Profiler/PayumCollector.php b/Profiler/PayumCollector.php
index e998fcc..58e928b 100644
--- a/Profiler/PayumCollector.php
+++ b/Profiler/PayumCollector.php
@@ -19,7 +19,7 @@ class PayumCollector extends DataCollector implements ExtensionInterface
     /**
      * {@inheritdoc}
      */
-    public function collect(Request $request, Response $response, \Throwable $exception = null): void
+    public function collect(Request $request, Response $response, ?\Throwable $exception = null): void
     {
         foreach ($this->contexts as $context) {
             $request = $context->getRequest();