diff --git a/services/following.py b/services/following.py
index 1811e716..4d04c27b 100644
--- a/services/following.py
+++ b/services/following.py
@@ -39,7 +39,8 @@ class FollowingManager:
     async def push(kind, payload):
         try:
             async with FollowingManager.lock:
-                for entity in FollowingManager.followers_by_kind.get(kind, []):
+                entities = FollowingManager.followers_by_kind.get(kind, [])
+                for entity in entities[:]:  # Use a copy to iterate
                     if payload.shout["created_by"] == entity.uid:
                         entity.queue.put_nowait(payload)
         except Exception as e: