diff --git a/server/app.py b/server/app.py
index e1ee72d..2ffbb4d 100644
--- a/server/app.py
+++ b/server/app.py
@@ -161,7 +161,7 @@ def tube_index_collector(ti_queue, ti_sender):
             ti_sender.send(item)
             item_old = item
             print("new item")
-        except ti_queue.Empty:
+        except Queue.Empty:
             print("emtpy")
             if item_old is not None:
                 ti_sender.send(item_old)