Gracefully handle unknown message types

CHANGELOG.md

@@ -5,6 +5,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [5.0.0-patch-1] - 2026-03-16
+
+- Gracefully handle unknown message types
+
 ## [5.0.0] - 2025-08-14
 
 - Moved channel field to root of AddTranscript message for multichannel transcription.

VERSION

@@ -1 +1 @@
-5.0.0
+5.0.0-patch-1

speechmatics/client.py

@@ -255,12 +255,15 @@ def _consumer(self, message):
         message = json.loads(message)
         message_type = message["message"]
 
-        for handler in self.event_handlers[message_type]:
-            try:
-                handler(copy.deepcopy(message))
-            except ForceEndSession:
-                LOGGER.warning("Session was ended forcefully by an event handler")
-                raise
+        try:
+            for handler in self.event_handlers[message_type]:
+                try:
+                    handler(copy.deepcopy(message))
+                except ForceEndSession:
+                    LOGGER.warning("Session was ended forcefully by an event handler")
+                    raise
+        except KeyError as kex:
+            LOGGER.debug(f"Unknown handler for message type: {message_type} {kex=}")
 
         if message_type == ServerMessageType.RecognitionStarted:
             self._flag_recognition_started()