diff --git a/server/app.py b/server/app.py
index 395629b..bf6a59a 100644
--- a/server/app.py
+++ b/server/app.py
@@ -153,10 +153,10 @@ def mqtt_publisher(artnetUniverse):
 def start_mqtt_publishers(universe_count):
     used_universes = universe_count
     print("universe count: "+str(used_universes))
-    universes_to_publish = range(1, used_universes + 1)
+    universes_to_publish = list(range(1, used_universes + 1))
     # Create and start a thread for each universe
     for universe in range(universes_to_publish):
-        threads = [threading.Thread(target=mqtt_publisher, args=(universe,))]
+        threads = [threading.Thread(target=mqtt_publisher, args=(int(universe),))]
 
     for thread in threads:
         thread.start()