diff --git a/warcprox/dedup.py b/warcprox/dedup.py
index d1e456d..f21e1df 100644
--- a/warcprox/dedup.py
+++ b/warcprox/dedup.py
@@ -292,11 +292,10 @@ class TroughDedupDb(object):
             return None
 
     def notify(self, recorded_url, records):
-        if (records[0].get_header(warctools.WarcRecord.TYPE) == warctools.WarcRecord.RESPONSE
+        if (records and records[0].type == b'response'
                 and recorded_url.response_recorder.payload_size() > 0):
             digest_key = warcprox.digest_str(
-                    recorded_url.payload_digest,
-                    self.options.base32)
+                    recorded_url.payload_digest, self.options.base32)
             if recorded_url.warcprox_meta and 'captures-bucket' in recorded_url.warcprox_meta:
                 self.save(
                         digest_key, records[0],