diff --git a/api/app/core/workflow/nodes/knowledge/node.py b/api/app/core/workflow/nodes/knowledge/node.py
index bd1ba998..c3fda4e2 100644
--- a/api/app/core/workflow/nodes/knowledge/node.py
+++ b/api/app/core/workflow/nodes/knowledge/node.py
@@ -334,7 +334,8 @@ class KnowledgeRetrievalNode(BaseNode):
             for kb_config in knowledge_bases:
                 db_knowledge = knowledge_repository.get_knowledge_by_id(db=db, knowledge_id=kb_config.kb_id)
                 if not (db_knowledge and db_knowledge.chunk_num > 0 and db_knowledge.status == 1):
-                    raise RuntimeError("The knowledge base does not exist or access is denied.")
+                    logger.warning("The knowledge base does not exist or access is denied.")
+                    continue
                 tasks.append(self.knowledge_retrieval(db, query, db_knowledge, kb_config))
             if tasks:
                 result = await asyncio.gather(*tasks)
diff --git a/api/app/schemas/app_schema.py b/api/app/schemas/app_schema.py
index 11c27b56..89603322 100644
--- a/api/app/schemas/app_schema.py
+++ b/api/app/schemas/app_schema.py
@@ -3,7 +3,7 @@ import uuid
 from typing import Optional, Any, List, Dict, Union
 from enum import Enum, StrEnum
 
-from pydantic import BaseModel, Field, ConfigDict, field_serializer, field_validator
+from pydantic import BaseModel, Field, ConfigDict, field_serializer, field_validator, model_serializer
 
 from app.schemas.workflow_schema import WorkflowConfigCreate
 
@@ -661,9 +661,11 @@ class DraftRunResponse(BaseModel):
     suggested_questions: List[str] = Field(default_factory=list, description="下一步建议问题")
     citations: List[Dict[str, Any]] = Field(default_factory=list, description="引用来源")
     audio_url: Optional[str] = Field(default=None, description="TTS 语音URL")
+    audio_status: Optional[str] = Field(default=None, description="TTS 语音状态")
 
-    def model_dump(self, **kwargs):
-        data = super().model_dump(**kwargs)
+    @model_serializer(mode="wrap")
+    def _serialize(self, handler):
+        data = handler(self)
         if not data.get("reasoning_content"):
             data.pop("reasoning_content", None)
         return data
diff --git a/api/app/schemas/conversation_schema.py b/api/app/schemas/conversation_schema.py
index fd1be5d9..20782fd9 100644
--- a/api/app/schemas/conversation_schema.py
+++ b/api/app/schemas/conversation_schema.py
@@ -2,7 +2,7 @@
 import uuid
 import datetime
 from typing import Optional, Dict, Any, List
-from pydantic import BaseModel, Field, ConfigDict, field_serializer
+from pydantic import BaseModel, Field, ConfigDict, field_serializer, model_serializer
 
 # 导入 FileInput（用于体验运行）
 from app.schemas.app_schema import FileInput
@@ -94,6 +94,18 @@ class ChatResponse(BaseModel):
     message_id: str
     usage: Optional[Dict[str, Any]] = None
     elapsed_time: Optional[float] = None
+    reasoning_content: Optional[str] = None
+    suggested_questions: Optional[List[str]] = None
+    citations: Optional[List[Any]] = None
+    audio_url: Optional[str] = None
+    audio_status: Optional[str] = None
+
+    @model_serializer(mode="wrap")
+    def _serialize(self, handler):
+        data = handler(self)
+        if not data.get("reasoning_content"):
+            data.pop("reasoning_content", None)
+        return data
 
 
 # ---------- Conversation Summary Schemas ----------
diff --git a/api/app/services/app_chat_service.py b/api/app/services/app_chat_service.py
index 7c52c2d6..12f54c03 100644
--- a/api/app/services/app_chat_service.py
+++ b/api/app/services/app_chat_service.py
@@ -317,7 +317,7 @@ class AppChatService:
             "suggested_questions": suggested_questions,
             "citations": filtered_citations,
             "audio_url": audio_url,
-            "audio_status": "pending"
+            "audio_status": "pending" if audio_url else None
         }
 
     async def agnet_chat_stream(
diff --git a/api/app/services/draft_run_service.py b/api/app/services/draft_run_service.py
index 10d50ece..2566a50f 100644
--- a/api/app/services/draft_run_service.py
+++ b/api/app/services/draft_run_service.py
@@ -754,7 +754,7 @@ class AgentRunService:
                 ) if not sub_agent else [],
                 "citations": filtered_citations,
                 "audio_url": audio_url,
-                "audio_status": "pending"
+                "audio_status": "pending" if audio_url else None
             }
 
             logger.info(