X-Git-Url: https://projects.mako.cc/source/twitter-api-cdsw/blobdiff_plain/043b63c67557591f1e85b53d17fc8a1a797f48ca..HEAD:/oauthlib/oauth2/rfc6749/grant_types/base.py

diff --git a/oauthlib/oauth2/rfc6749/grant_types/base.py b/oauthlib/oauth2/rfc6749/grant_types/base.py
index 4a8017f..9fc632f 100644
--- a/oauthlib/oauth2/rfc6749/grant_types/base.py
+++ b/oauthlib/oauth2/rfc6749/grant_types/base.py
@@ -23,7 +23,8 @@ class GrantTypeBase(object):
         raise NotImplementedError('Subclasses must implement this method.')
 
     def validate_grant_type(self, request):
-        if not self.request_validator.validate_grant_type(request.client_id,
+        client_id = getattr(request, 'client_id', None)
+        if not self.request_validator.validate_grant_type(client_id,
                                                           request.grant_type, request.client, request):
             log.debug('Unauthorized from %r (%r) access to grant type %s.',
                       request.client_id, request.client, request.grant_type)