diff --git a/aiogram/dispatcher/event/observer.py b/aiogram/dispatcher/event/observer.py
index f40a8014..65d35eb1 100644
--- a/aiogram/dispatcher/event/observer.py
+++ b/aiogram/dispatcher/event/observer.py
@@ -114,7 +114,7 @@ class TelegramEventObserver(EventObserver):
 
             # Clean full config to prevent to re-initialize another filter with the same configuration
             for key in f.__fields__:
-                full_config.pop(key)
+                full_config.pop(key, None)
 
             filters.append(f)