--- a/WebBrowser/Download/DownloadManager.py	Tue Apr 10 19:43:45 2018 +0200
+++ b/WebBrowser/Download/DownloadManager.py	Wed Apr 11 19:57:23 2018 +0200
@@ -242,6 +242,7 @@
             SafeBrowsingManager
         if SafeBrowsingManager.isEnabled():
             threatLists = WebBrowserWindow.safeBrowsingManager().lookupUrl(url)
+            # TODO: handle threatLists being None (indicating a lookup error)
             if threatLists:
                 threatMessages = WebBrowserWindow.safeBrowsingManager()\
                     .getThreatMessages(threatLists)