diff --git a/storage/http_map_files_downloader.cpp b/storage/http_map_files_downloader.cpp
index a93b4ebbaf..fa4b08f769 100644
--- a/storage/http_map_files_downloader.cpp
+++ b/storage/http_map_files_downloader.cpp
@@ -38,6 +38,7 @@ void HttpMapFilesDownloader::DownloadMapFile(vector<string> const & urls, string
 MapFilesDownloader::TProgress HttpMapFilesDownloader::GetDownloadingProgress()
 {
   ASSERT_THREAD_CHECKER(m_checker, ());
+  ASSERT(nullptr != m_request, ());
   return m_request->Progress();
 }