diff --git a/external/messenger.py b/external/messenger.py
index 01453ec..1ce6383 100755
--- a/external/messenger.py
+++ b/external/messenger.py
@@ -50,7 +50,6 @@ EVENT_MESSAGE = "message"
 EVENT_ACTION = "action"
 
 
-
 def mediaObjectOfURL(url):
     return {
             "filename": url.split("?")[0].split("/")[-1],
@@ -336,6 +335,7 @@ class MessengerBridge:
             self.setup_joined_thread(thread)
 
     def setup_joined_thread(self, thread):
+        sys.stderr.write("(python) setup_joined_thread {}".format(thread))
         if thread.type == ThreadType.GROUP:
             members = self.client.fetchAllUsersFromThreads([thread])