diff --git a/search.py b/search.py
index abfa8e9..7a76b47 100755
--- a/search.py
+++ b/search.py
@@ -36,7 +36,8 @@
     sys.exit(1)
 
 print_header_line()
-doc = message.doc[0]
-for c in doc.child:
+if len(message.doc) > 0:
+  doc = message.doc[0]
+  for c in doc.child:
     print_result_line(c)