diff --git a/webservice/webservice.py b/webservice/webservice.py
index 0e53747df873167455b811a014d70ff9523a4f81..2ce0f9d3eabb3de3de24fffcf479c9c67f2bcc89 100644
--- a/webservice/webservice.py
+++ b/webservice/webservice.py
@@ -1287,7 +1287,7 @@ class ActionsServer:
                 # Notebooks require one or three runs, depending on the
                 # detector type and operation mode.
                 triple = any(
-                    det in karabo_id for det in config['dark']['three-gain-detectors'])  # noqa
+                    det in karabo_id for det in self.config['dark']['three-gain-detectors'])  # noqa
 
                 # This fails silently if the hardcoded strings above are
                 # ever changed (triple = False) but the underlying notebook