diff --git a/server/app.py b/server/app.py
index 21067a3..a96a6b6 100644
--- a/server/app.py
+++ b/server/app.py
@@ -150,6 +150,8 @@ def mqtt_publisher():
             sys.exit()
 
 if __name__ == "__main__":
+    global result
+    result = None
     tube_index_updater_thread = Process(target=update_tube_index)
     tube_index_updater_thread.start()
     flask_thread = Process(target=flask_api)