diff --git a/wlauto/core/agenda.py b/wlauto/core/agenda.py
index 55feae70..91144e74 100644
--- a/wlauto/core/agenda.py
+++ b/wlauto/core/agenda.py
@@ -139,7 +139,7 @@ class Agenda(object):
 
     def __init__(self, source=None):
         self.filepath = None
-        self.config = None
+        self.config = {}
         self.global_ = None
         self.sections = []
         self.workloads = []