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-rw-r--r--python/fatcat_tools/importers/pubmed.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/python/fatcat_tools/importers/pubmed.py b/python/fatcat_tools/importers/pubmed.py
index aeac43b5..64f5a024 100644
--- a/python/fatcat_tools/importers/pubmed.py
+++ b/python/fatcat_tools/importers/pubmed.py
@@ -376,7 +376,7 @@ class PubmedImporter(EntityImporter):
identifiers = pubmed.ArticleIdList
pmid = medline.PMID.string.strip()
doi = identifiers.find("ArticleId", IdType="doi")
- if doi:
+ if doi and doi.string:
doi = doi.string.lower().strip()
if doi.startswith('doi:'):
doi = doi[4:]