diff --git a/rhodecode/lib/celerylib/__init__.py b/rhodecode/lib/celerylib/__init__.py
--- a/rhodecode/lib/celerylib/__init__.py
+++ b/rhodecode/lib/celerylib/__init__.py
@@ -43,6 +43,9 @@ class ResultWrapper(object):
 
 def run_task(task, *args, **kwargs):
     log.debug('Got task `%s` for execution', task)
+    if task is None:
+        raise ValueError('Got non-existing task for execution')
+
     if rhodecode.CELERY_ENABLED:
         celery_is_up = False
         try:
diff --git a/rhodecode/lib/celerylib/tasks.py b/rhodecode/lib/celerylib/tasks.py
--- a/rhodecode/lib/celerylib/tasks.py
+++ b/rhodecode/lib/celerylib/tasks.py
@@ -386,9 +386,7 @@ def beat_check(*args, **kwargs):
     return time.time()
 
 
-@async_task(ignore_result=True)
-def sync_last_update(*args, **kwargs):
-
+def sync_last_update_for_objects(*args, **kwargs):
     skip_repos = kwargs.get('skip_repos')
     if not skip_repos:
         repos = Repository.query() \
@@ -405,3 +403,8 @@ def sync_last_update(*args, **kwargs):
         for root_gr in repo_groups:
             for repo_gr in reversed(root_gr.recursive_groups()):
                 repo_gr.update_commit_cache()
+
+
+@async_task(ignore_result=True)
+def sync_last_update(*args, **kwargs):
+    sync_last_update_for_objects(*args, **kwargs)