diff --git a/deluge/core/core.py b/deluge/core/core.py
index a73bb6485..6f9621bdd 100644
--- a/deluge/core/core.py
+++ b/deluge/core/core.py
@@ -487,7 +487,7 @@ class Core(component.Component):
             try:
                 config[key] = self.config[key]
             except KeyError:
-                config[key] = None
+                pass
         return config
 
     @export