diff --git a/trains_agent/commands/worker.py b/trains_agent/commands/worker.py
index bae0483..9fc9d84 100644
--- a/trains_agent/commands/worker.py
+++ b/trains_agent/commands/worker.py
@@ -1870,6 +1870,7 @@ class Worker(ServiceCommandSection):
         docker = 'docker'
 
         base_cmd = [docker, 'run', '-t']
+        update_scheme = ""
         dockers_nvidia_visible_devices = 'all'
         gpu_devices = os.environ.get('NVIDIA_VISIBLE_DEVICES', None)
         if gpu_devices is None or gpu_devices.lower().strip() == 'all':
diff --git a/trains_agent/session.py b/trains_agent/session.py
index 618a71f..6473c49 100644
--- a/trains_agent/session.py
+++ b/trains_agent/session.py
@@ -177,7 +177,7 @@ class Session(_Session):
         folder_keys = ('agent.venvs_dir', 'agent.vcs_cache.path',
                        'agent.pip_download_cache.path',
                        'agent.docker_pip_cache', 'agent.docker_apt_cache')
-        singleton_folders = ('agent.venvs_dir', 'agent.vcs_cache.path',)
+        singleton_folders = ('agent.venvs_dir', 'agent.vcs_cache.path', 'agent.docker_apt_cache')
 
         if os.environ.get(ENV_TASK_EXECUTE_AS_USER):
             folder_keys = tuple(list(folder_keys) + ['sdk.storage.cache.default_base_dir'])