Ticket #7716: 7716-select-related.diff

db/models/query.py

@@ -778 +778 @@
     restricted = requested is not None
     index_end = index_start + len(klass._meta.fields)
     obj = klass(*row[index_start:index_end])
+    if obj.pk is None:
+        return None, index_end
     for f in klass._meta.fields:
         if not select_related_descend(f, restricted, requested):
             continue