Support None if initial part of dotted lookup returns None. Closes #1223.

1 files changed, 3 insertions, 0 deletions

diff --git a/rest_framework/fields.py b/rest_framework/fields.py
index 8cc8e81e..24ddb7a4 100644
--- a/rest_framework/fields.py
+++ b/rest_framework/fields.py
@@ -57,6 +57,9 @@ def get_attribute(instance, attrs):
     Also accepts either attribute lookup on objects or dictionary lookups.
     """
     for attr in attrs:
+        if instance is None:
+            # Break out early if we get `None` at any point in a nested lookup.
+            return None
         try:
             instance = getattr(instance, attr)
         except ObjectDoesNotExist: