diff --git a/bstrd/bscache.py b/bstrd/bscache.py
index 3a77978..39d7f9f 100644
--- a/bstrd/bscache.py
+++ b/bstrd/bscache.py
@@ -35,7 +35,7 @@ class BSCache:
 
     def run(self, running):
         timeout_counter = 0
-        configs = self.channels.values()
+        configs = self.channels.values() or None
         with source(channels=configs, **self.kwargs) as src:
             while running.is_set():
                 msg = src.receive()