diff --git a/kallithea/lib/celerylib/__init__.py b/kallithea/lib/celerylib/__init__.py
--- a/kallithea/lib/celerylib/__init__.py
+++ b/kallithea/lib/celerylib/__init__.py
@@ -102,7 +102,7 @@ def __get_lockkey(func, *fargs, **fkwarg
 def locked_task(func):
     def __wrapper(func, *fargs, **fkwargs):
         lockkey = __get_lockkey(func, *fargs, **fkwargs)
-        lockkey_path = config['tg.cache_dir']  # The configured cache_dir is only available under this name ...
+        lockkey_path = config.get('cache_dir') or config['app_conf']['cache_dir']  # Backward compatibility for TurboGears < 2.4
 
         log.info('running task with lockkey %s', lockkey)
         try:
diff --git a/kallithea/lib/celerylib/tasks.py b/kallithea/lib/celerylib/tasks.py
--- a/kallithea/lib/celerylib/tasks.py
+++ b/kallithea/lib/celerylib/tasks.py
@@ -73,7 +73,7 @@ def get_commits_stats(repo_name, ts_min_
     DBS = celerylib.get_session()
     lockkey = celerylib.__get_lockkey('get_commits_stats', repo_name, ts_min_y,
                             ts_max_y)
-    lockkey_path = config['tg.cache_dir']  # The configured cache_dir is only available under this name ...
+    lockkey_path = config.get('cache_dir') or config['app_conf']['cache_dir']  # Backward compatibility for TurboGears < 2.4
 
     log.info('running task with lockkey %s', lockkey)