diff --git a/dota.py b/dota.py
index 479389d..73b0b77 100644
--- a/dota.py
+++ b/dota.py
@@ -124,7 +124,12 @@ class Friend(BaseModel):
     if limit > 10:
       limit = 10
     for friend in friends:
-      matches.extend(friend.serialize_recent_matches(limit=limit))
+      matches_ = friend.serialize_recent_matches(limit=limit)
+      if not matches_:
+        continue
+      matches.extend(matches_)
+    if not matches:
+      return None
     # sort matches by start_time from latest to oldest
     matches.sort(key=lambda x: x['start_time'], reverse=True)
     name = friends[0].name