diff --git a/listener_manager.py b/listener_manager.py
index 8655545..75f4455 100644
--- a/listener_manager.py
+++ b/listener_manager.py
@@ -20,6 +20,11 @@ class ListenerManager:
             print(f"Listener for user {user.id} is already running.")
             return
 
+        # Guard Clause: Ensure the user has a valid platform ID required by twitchio.
+        if not user.platform_user_id:
+            print(f"ERROR: Cannot start listener for user {user.id}. Missing platform_user_id.")
+            return
+
         print(f"Starting listener for user {user.id} ({user.username})...")
         
         tokens = security.decrypt_tokens(user.encrypted_tokens)