diff --git a/server/app.py b/server/app.py
index 425728c..e1ee72d 100644
--- a/server/app.py
+++ b/server/app.py
@@ -159,7 +159,10 @@ def tube_index_collector(ti_queue, ti_sender):
         try:
             item = ti_queue.get(block=False)
             ti_sender.send(item)
+            item_old = item
+            print("new item")
         except ti_queue.Empty:
+            print("emtpy")
             if item_old is not None:
                 ti_sender.send(item_old)
             else: