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-rw-r--r--python/fatcat_tools/importers/jalc.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/python/fatcat_tools/importers/jalc.py b/python/fatcat_tools/importers/jalc.py
index 24da60ea..8dd4f3e5 100644
--- a/python/fatcat_tools/importers/jalc.py
+++ b/python/fatcat_tools/importers/jalc.py
@@ -174,7 +174,7 @@ class JalcImporter(EntityImporter):
release_date = datetime.datetime.strptime(date['completed-date'], DATE_FMT).date()
release_year = release_date.year
release_date = release_date.isoformat()
- elif len(date) is 4:
+ elif len(date) is 4 and date.isdigit():
release_year = int(date)
pages = None