@@ -70,14 +70,15 @@ class OpenrouterAdapter:
 
                         try:
                             data_obj = json.loads(data)
-                            content_chunk = data_obj['choices'][0]['delta'].get('content') or ''
-                            reasoning_chunk = data_obj['choices'][0]['delta'].get('reasoning') or ''
-                            if content_chunk:
-                                content += content_chunk
-                                yield RawSSEChunk(event='token', data={'content': content_chunk})
-                            if reasoning_chunk:
-                                reasoning += reasoning_chunk
-                                yield RawSSEChunk(event='think', data={'content': reasoning_chunk})
+                            if data_obj.get('choices'):
+                                content_chunk = data_obj['choices'][0].get('delta', {}).get('content') or ''
+                                reasoning_chunk = data_obj['choices'][0].get('delta', {}).get('reasoning') or ''
+                                if content_chunk:
+                                    content += content_chunk
+                                    yield RawSSEChunk(event='token', data={'content': content_chunk})
+                                if reasoning_chunk:
+                                    reasoning += reasoning_chunk
+                                    yield RawSSEChunk(event='think', data={'content': reasoning_chunk})
                             if data_obj.get('usage'):
                                 input_tokens = data_obj['usage']['prompt_tokens']
                                 output_tokens = data_obj['usage']['completion_tokens']