From fa547bd4d49bd4316c43957bdafd00e2c6813a02 Mon Sep 17 00:00:00 2001
From: Martin Czygan <martin.czygan@gmail.com>
Date: Thu, 26 Nov 2020 21:21:10 +0100
Subject: extra might be None

---
 fuzzycat/verify.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fuzzycat/verify.py b/fuzzycat/verify.py
index d7b2d62..ffd0f47 100644
--- a/fuzzycat/verify.py
+++ b/fuzzycat/verify.py
@@ -171,7 +171,7 @@ def compare(a, b):
     # beware: we have versions and "isPartOf", e.g. https://api.fatcat.wiki/v0/release/ybxygpeypbaq5pfrztu3z2itw4
     # TODO: does glom help?
     # ...
-    if "datacite" in a.get("extra") and "datacite" in b.get("extra"):
+    if "datacite" in a.get("extra", {}) and "datacite" in b.get("extra", {}):
         # Relevant relationType values: IsSupplementTo, IsSupplementedBy,
         # HasVersion, IsVersionOf, IsNewVersionOf, IsPreviousVersionOf
         whitelist = set([
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