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-rw-r--r--fatcat_scholar/schema.py4
1 files changed, 3 insertions, 1 deletions
diff --git a/fatcat_scholar/schema.py b/fatcat_scholar/schema.py
index 5306130..4287d53 100644
--- a/fatcat_scholar/schema.py
+++ b/fatcat_scholar/schema.py
@@ -482,7 +482,9 @@ def es_biblio_from_release(release: ReleaseEntity) -> ScholarBiblio:
if release.container:
publisher = release.container.publisher or release.publisher
- publisher_type = release.container.extra.get("publisher_type", None)
+ publisher_type = release.container.extra and release.container.extra.get(
+ "publisher_type", None
+ )
if not publisher_type or not isinstance(publisher_type, str):
publisher_type = None
container_name = release.container.name