diff --git a/bookwyrm/importers/librarything_import.py b/bookwyrm/importers/librarything_import.py
index c6833547d..ea31b46eb 100644
--- a/bookwyrm/importers/librarything_import.py
+++ b/bookwyrm/importers/librarything_import.py
@@ -19,7 +19,7 @@ class LibrarythingImporter(Importer):
         normalized = {k: remove_brackets(entry.get(v)) for k, v in mappings.items()}
         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
+        normalized["isbn_13"] = isbn_13[1] if len(isbn_13) > 1 else None
         return normalized
 
     def get_shelf(self, normalized_row):
diff --git a/bookwyrm/models/import_job.py b/bookwyrm/models/import_job.py
index bdd88c687..a489edb7c 100644
--- a/bookwyrm/models/import_job.py
+++ b/bookwyrm/models/import_job.py
@@ -252,9 +252,12 @@ class ImportItem(models.Model):
     @property
     def rating(self):
         """x/5 star rating for a book"""
-        if self.normalized_data.get("rating"):
+        if not self.normalized_data.get("rating"):
+            return None
+        try:
             return float(self.normalized_data.get("rating"))
-        return None
+        except ValueError:
+            return None
 
     @property
     def date_added(self):