diff --git a/lib/tfw/networking/server/tfw_server.py b/lib/tfw/networking/server/tfw_server.py
index f0471ef..5f297df 100644
--- a/lib/tfw/networking/server/tfw_server.py
+++ b/lib/tfw/networking/server/tfw_server.py
@@ -2,6 +2,7 @@
 # All Rights Reserved. See LICENSE file for details.
 
 from abc import ABC, abstractmethod
+from contextlib import suppress
 
 from tornado.web import Application
 
@@ -61,8 +62,9 @@ class MessageStorage(ABC):
         self.saved_messages = []
 
     def save_message(self, message):
-        if self.filter_message(message):
-            self.saved_messages.extend(self.transform_message(message))
+        with suppress(KeyError, AttributeError):
+            if self.filter_message(message):
+                self.saved_messages.extend(self.transform_message(message))
 
     @abstractmethod
     def filter_message(self, message):