ProtocolServer: Don't crash on failed request

The CNetworkJob::on_finish hook will be invoked both for success and
failure, but there will only be a m_job->response() in the success case
so we have to null-check it before using it.

This should have been obvious from the "->"

1 files changed, 2 insertions, 1 deletions

diff --git a/Servers/ProtocolServer/HttpDownload.cpp b/Servers/ProtocolServer/HttpDownload.cpp
index b20c553a58..c4117ccf5b 100644
--- a/Servers/ProtocolServer/HttpDownload.cpp
+++ b/Servers/ProtocolServer/HttpDownload.cpp
@@ -7,7 +7,8 @@ HttpDownload::HttpDownload(PSClientConnection& client, NonnullRefPtr<CHttpJob>&&
     , m_job(job)
 {
     m_job->on_finish = [this](bool success) {
-        set_payload(m_job->response()->payload());
+        if (m_job->response())
+            set_payload(m_job->response()->payload());
         did_finish(success);
     };
 }