diff --git a/server/app.py b/server/app.py
index 4db53dc..8cc88a4 100644
--- a/server/app.py
+++ b/server/app.py
@@ -155,7 +155,7 @@ def start_mqtt_publishers(universe_count):
     print("universe count: "+str(used_universes))
     universes_to_publish = list(range(1, used_universes + 1))
     # Create and start a thread for each universe
-    print(universes_to_publish)
+    print(str(universes_to_publish))
     for universe in range(universes_to_publish):
         print(universe)
         threads = [threading.Thread(target=mqtt_publisher, args=(int(universe),))]