diff --git a/src/WebPush.php b/src/WebPush.php
index f1121bc..67eea42 100644
--- a/src/WebPush.php
+++ b/src/WebPush.php
@@ -182,7 +182,12 @@ public function flush(?int $batchSize = null): \Generator
                     })
                     ->otherwise(function ($reason) {
                         /** @var RequestException $reason **/
-                        return new MessageSentReport($reason->getRequest(), $reason->getResponse(), false, $reason->getMessage());
+                        if (method_exists($reason, 'getResponse')) {
+                            $response = $reason->getResponse();
+                        } else {
+                            $response = null;
+                        }
+                        return new MessageSentReport($reason->getRequest(), $response, false, $reason->getMessage());
                     });
             }