diff --git a/cps/epub.py b/cps/epub.py
index 4a11769c..91d70176 100644
--- a/cps/epub.py
+++ b/cps/epub.py
@@ -102,7 +102,10 @@ def get_epub_info(tmp_file_path, original_file_name, original_file_extension):
 
     identifiers = []
     for node in p.xpath('dc:identifier', namespaces=ns):
-        identifier_name = node.attrib.values()[-1]
+        try:
+            identifier_name = node.attrib.values()[-1]
+        except IndexError:
+            continue
         identifier_value = node.text
         if identifier_name in ('uuid', 'calibre') or identifier_value is None:
             continue