diff --git a/oml/media/epub.py b/oml/media/epub.py
index 960a11d..b848200 100644
--- a/oml/media/epub.py
+++ b/oml/media/epub.py
@@ -42,7 +42,10 @@ def cover(path):
 
     def use(filename):
         logger.debug('using %s', filename)
-        data = z.read(filename)
+        try:
+            data = z.read(filename)
+        except:
+            return None
         r = get_ratio(data)
         if r < 0.3 or r > 2:
             return None