diff --git a/subathon/channel.py b/subathon/channel.py
index cc87b3a..c0b8638 100644
--- a/subathon/channel.py
+++ b/subathon/channel.py
@@ -106,8 +106,8 @@ async def prepare_subathon(
         if contrib.profileid:
             profile = await profiler.get_profile(contrib.profileid)
             assert profile is not None
-            name = profile.nickname
-            user_id = None
+            name = profile.nickname or "Unknown"
+            user_id = str(profile.profileid)
         else:
             name = "Anonymous"
             user_id = None