diff --git a/madeleine/app.py b/madeleine/app.py
index 395e47c7ec199dc388921458cc933153d5fce9ca..c31f6359ca935d0c72c0eaeb9a4d73daf3015c89 100644
--- a/madeleine/app.py
+++ b/madeleine/app.py
@@ -46,7 +46,7 @@ class Madeleine(App):
         self.dispatch_destination_task_slugs = self.config["dispatch_destination_task_slugs"]
         self.default_dispatch_destination_task_model_slug = self.config["default_dispatch_destination_task_model_slug"]
         self.combine_source_document_model_slugs = self.config["combine_source_document_model_slugs"]
-        self.tracker_version_statuses = self.config["tracker_version_statuses"]
+        self.tracker_version_statuses = self.config["tracker_version_statuses"] or {}
         self.tracker_summary_recipient_group = self.config["tracker_summary_recipient_group"]
         self.dispatch_movie_suffix = self.config["dispatch_movie_suffix"]
         self.dispatch_data_file_format = self.config["dispatch_data_file_format"]