diff --git a/swh/loader/core/tasks.py b/swh/loader/core/tasks.py
index 9db4fb3..d64aa4c 100644
--- a/swh/loader/core/tasks.py
+++ b/swh/loader/core/tasks.py
@@ -1,42 +1,42 @@
 # Copyright (C) 2015  The Software Heritage developers
 # See the AUTHORS file at the top-level directory of this distribution
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
 import logging
 
 from swh.scheduler.task import Task
 from swh.model.git import GitType
 
 
 class LoaderCoreTask(Task):
     """Main task to inherit from and implement run function.
 
     """
     def __init__(self):
         l = logging.getLogger('requests.packages.urllib3.connectionpool')
         l.setLevel(logging.WARN)
 
     def open_fetch_history(self, storage, origin_id):
         return storage.fetch_history_start(origin_id)
 
     def close_fetch_history(self, storage, fetch_history_id, res):
         result = None
-        if 'objects' in res:
+        if res and 'objects' in res:
             result = {
                 'contents': len(res['objects'].get(GitType.BLOB, [])),
                 'directories': len(res['objects'].get(GitType.TREE, [])),
                 'revisions': len(res['objects'].get(GitType.COMM, [])),
                 'releases': len(res['objects'].get(GitType.RELE, [])),
                 'occurrences': len(res['objects'].get(GitType.REFS, [])),
             }
 
         data = {
             'status': res['status'],
             'result': result,
             'stderr': res.get('stderr')
         }
         return storage.fetch_history_end(fetch_history_id, data)
 
     def run(self, *args, **kwargs):
         raise NotImplemented('Need to be overriden by subclass.')