From be8cac2be49b44a8a1c600dacc1c47c42f12ffc1 Mon Sep 17 00:00:00 2001
From: Martin Czygan <martin.czygan@gmail.com>
Date: Thu, 17 Dec 2020 16:27:53 +0100
Subject: check doi existence

---
 fuzzycat/verify.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fuzzycat/verify.py b/fuzzycat/verify.py
index 1cf8f3c..00d76ba 100644
--- a/fuzzycat/verify.py
+++ b/fuzzycat/verify.py
@@ -158,7 +158,9 @@ def verify(a: Dict, b: Dict, min_title_length=5) -> Tuple[str, str]:
 
     # A few items have the same DOI.
     try:
-        if glom(a, "ext_ids.doi") == glom(b, "ext_ids.doi"):
+        a_doi = glom(a, "ext_ids.doi")
+        b_doi = glom(b, "ext_ids.doi")
+        if a_doi is not None and a_doi == b_doi:
             return Verify(Status.EXACT, Reason.DOI)
     except PathAccessError:
         pass
-- 
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