diff --git a/fluents/workflow.py b/fluents/workflow.py
index c876e57..da5468f 100644
--- a/fluents/workflow.py
+++ b/fluents/workflow.py
@@ -243,6 +243,8 @@ class Options(dict):
         dict.__init__(self, *args, **kw)
         self['out_plots'] = None
         self['out_data'] = None
+	self['all_plots'] = []
+	self['all_data'] = []
 
     def _copy_from_list(self, key_list):
         """Returns suboptions (dictionary) from a list of keys.