diff --git a/bookwyrm/models/book.py b/bookwyrm/models/book.py
index 0920a9313..b993ef5eb 100644
--- a/bookwyrm/models/book.py
+++ b/bookwyrm/models/book.py
@@ -61,6 +61,8 @@ class Book(ActivitypubMixin, BookWyrmModel):
     @property
     def ap_cover(self):
         ''' an image attachment '''
+        if not self.cover or not hasattr(self.cover, 'url'):
+            return []
         return [activitypub.Image(
             url='https://%s%s' % (DOMAIN, self.cover.url),
         )]
diff --git a/bookwyrm/models/import_job.py b/bookwyrm/models/import_job.py
index f7b5e8a29..891bfd1b7 100644
--- a/bookwyrm/models/import_job.py
+++ b/bookwyrm/models/import_job.py
@@ -72,7 +72,7 @@ class ImportItem(models.Model):
     def get_book_from_isbn(self):
         ''' search by isbn '''
         search_result = books_manager.first_search_result(
-            self.isbn, min_confidence=0.992
+            self.isbn, min_confidence=0.995
         )
         if search_result:
             try:
@@ -90,7 +90,7 @@ class ImportItem(models.Model):
             self.data['Author']
         )
         search_result = books_manager.first_search_result(
-            search_term, min_confidence=0.992
+            search_term, min_confidence=0.995
         )
         if search_result:
             try: