diff --git a/libervia/backend/plugins/plugin_xep_0045.py b/libervia/backend/plugins/plugin_xep_0045.py
index 3c20706a..25ed7f90 100644
--- a/libervia/backend/plugins/plugin_xep_0045.py
+++ b/libervia/backend/plugins/plugin_xep_0045.py
@@ -907,7 +907,7 @@ class XEP_0045:
         @return: The joined room.
         @raise AlreadyJoined: The room is already joined by this profile.
         """
-        if nick is None:
+        if not nick:
             nick = client.jid.user
         if options is None:
             options = {}