--- a/taskcluster/taskgraph/task/nightly_fennec.py
+++ b/taskcluster/taskgraph/task/nightly_fennec.py
@@ -20,17 +20,20 @@ logger = logging.getLogger(__name__)
 GECKO = os.path.realpath(os.path.join(__file__, '..', '..', '..', '..'))
 ARTIFACT_URL = 'https://queue.taskcluster.net/v1/task/{}/artifacts/{}'
 INDEX_URL = 'https://index.taskcluster.net/v1/task/{}'
 
 
 class NightlyFennecTask(base.Task):
 
     def __init__(self, *args, **kwargs):
-        self.task_dict = kwargs.pop('task_dict')
+        try:
+            self.task_dict = kwargs.pop('task_dict')
+        except KeyError:
+            pass
         super(NightlyFennecTask, self).__init__(*args, **kwargs)
 
     @classmethod
     def load_tasks(cls, kind, path, config, params, loaded_tasks):
         root = os.path.abspath(os.path.join(path, config[
             'nightly_fennec_path']))
 
         project = params['project']