diff --git a/libervia/backend/plugins/plugin_xep_0167/__init__.py b/libervia/backend/plugins/plugin_xep_0167/__init__.py
index 9a36b042..572045c7 100644
--- a/libervia/backend/plugins/plugin_xep_0167/__init__.py
+++ b/libervia/backend/plugins/plugin_xep_0167/__init__.py
@@ -513,7 +513,7 @@ class XEP_0167(BaseApplicationHandler):
         application_data = content_data["application_data"]
         if action == self._j.A_PREPARE_CONFIRMATION:
             session["metadata"] = {}
-            session["peer_metadata"] = {}
+            session.setdefault("peer_metadata", {})
             try:
                 media = application_data["media"] = desc_elt["media"]
             except KeyError: