diff --git a/server/app.py b/server/app.py
index 860b006..14c6b4b 100644
--- a/server/app.py
+++ b/server/app.py
@@ -120,7 +120,7 @@ def mqtt_publisher(ti_receiver):
             tube_index = literal_eval(ti_receiver.recv())
         except:
             tube_index = tube_index_old
-
+            tube_index = None
         tube_index_old = tube_index
         try:
             # Gets whatever the last Art-Net packet we received is