diff --git a/changelog/4507.fixed.md b/changelog/4507.fixed.md
new file mode 100644
index 000000000..56e2485d1
--- /dev/null
+++ b/changelog/4507.fixed.md
@@ -0,0 +1 @@
+- Fixed `ElevenLabsSTTService` crashing when `language` was passed as `None`. When `language` is not set, the service now lets ElevenLabs auto-detect the audio language.
diff --git a/src/pipecat/services/elevenlabs/stt.py b/src/pipecat/services/elevenlabs/stt.py
index 315cf5af6..1e1d942cf 100644
--- a/src/pipecat/services/elevenlabs/stt.py
+++ b/src/pipecat/services/elevenlabs/stt.py
@@ -358,7 +358,8 @@ class ElevenLabsSTTService(SegmentedSTTService):
 
         # Add required model_id and language_code
         data.add_field("model_id", self._settings.model)
-        data.add_field("language_code", self._settings.language)
+        if self._settings.language:
+            data.add_field("language_code", self._settings.language)
         if self._settings.tag_audio_events is not None:
             data.add_field("tag_audio_events", str(self._settings.tag_audio_events).lower())
         keyterms = self._settings.keyterms