diff --git a/dump_html.py b/dump_html.py
index ec0459c..6455360 100755
--- a/dump_html.py
+++ b/dump_html.py
@@ -19,9 +19,13 @@ name = ensure_unicode(sys.argv[3])
 output_file = sys.argv[4]
 
 parser = WeChatDBParser(db_file)
-msgs = parser.msgs_by_talker[name]
 res = Resource(resource_dir)
 
+try:
+    msgs = parser.msgs_by_talker[name]
+except:
+    sys.exit("Couldn't find that contact: valid contacts: " . parser.msgs_by_talker.keys);
+
 render = HTMLRender(parser, res)
 htmls = render.render_msgs(msgs)