diff --git a/bookwyrm/importers/librarything_import.py b/bookwyrm/importers/librarything_import.py
index 1b61a6f1..37730dee 100644
--- a/bookwyrm/importers/librarything_import.py
+++ b/bookwyrm/importers/librarything_import.py
@@ -14,7 +14,8 @@ class LibrarythingImporter(Importer):
         """use the dataclass to create the formatted row of data"""
         remove_brackets = lambda v: re.sub(r"\[|\]", "", v) if v else None
         normalized = {k: remove_brackets(entry.get(v)) for k, v in mappings.items()}
-        isbn_13 = normalized["isbn_13"].split(", ")
+        isbn_13 = normalized.get("isbn_13")
+        isbn_13 = isbn_13.split(", ") if isbn_13 else []
         normalized["isbn_13"] = isbn_13[1] if len(isbn_13) > 0 else None
         return normalized