diff --git a/fedn/fedn/network/api/client.py b/fedn/fedn/network/api/client.py
index 019436f99..ea7e0b07d 100644
--- a/fedn/fedn/network/api/client.py
+++ b/fedn/fedn/network/api/client.py
@@ -1,5 +1,3 @@
-import uuid
-
 import requests
 
 __all__ = ['APIClient']
@@ -139,9 +137,6 @@ def start_session(self, session_id=None, round_timeout=180, rounds=5, round_buff
         :return: A dict with success or failure message and session config.
         :rtype: dict
         """
-        # If session id is None, generate a random session id.
-        if session_id is None:
-            session_id = str(uuid.uuid4())
         response = requests.post(self._get_url('start_session'), json={
             'session_id': session_id,
             'round_timeout': round_timeout,
diff --git a/fedn/fedn/network/api/interface.py b/fedn/fedn/network/api/interface.py
index 51bc3d636..f0e411820 100644
--- a/fedn/fedn/network/api/interface.py
+++ b/fedn/fedn/network/api/interface.py
@@ -2,6 +2,7 @@
 import copy
 import os
 import threading
+import uuid
 from io import BytesIO
 
 from flask import jsonify, send_from_directory
@@ -869,19 +870,20 @@ def start_session(
         model_id = self.statestore.get_latest_model()
 
         # Setup session config
-        session_config = {"session_id": session_id,
-                          "round_timeout": round_timeout,
-                          "buffer_size": round_buffer_size,
-                          "model_id": model_id,
-                          "rounds": rounds,
-                          "delete_models_storage": delete_models,
-                          "clients_required": min_clients,
-                          "clients_requested": requested_clients,
-                          "task": (''),
-                          "validate": validate,
-                          "helper_type": helper,
-                          "model_tag": model_tag
-                          }
+        session_config = {
+            "session_id": session_id if session_id else str(uuid.uuid4()),
+            "round_timeout": round_timeout,
+            "buffer_size": round_buffer_size,
+            "model_id": model_id,
+            "rounds": rounds,
+            "delete_models_storage": delete_models,
+            "clients_required": min_clients,
+            "clients_requested": requested_clients,
+            "task": (""),
+            "validate": validate,
+            "helper_type": helper,
+            "model_tag": model_tag
+        }
 
         # Start session
         threading.Thread(