diff --git a/api/controllers/console/explore/conversation.py b/api/controllers/console/explore/conversation.py
index a8d46954b..43ad3ecfb 100644
--- a/api/controllers/console/explore/conversation.py
+++ b/api/controllers/console/explore/conversation.py
@@ -61,7 +61,6 @@ class ConversationApi(InstalledAppResource):
             ConversationService.delete(app_model, conversation_id, current_user)
         except ConversationNotExistsError:
             raise NotFound("Conversation Not Exists.")
-        WebConversationService.unpin(app_model, conversation_id, current_user)
 
         return {"result": "success"}, 204
 
diff --git a/api/controllers/web/conversation.py b/api/controllers/web/conversation.py
index ea4138826..24de4f3f2 100644
--- a/api/controllers/web/conversation.py
+++ b/api/controllers/web/conversation.py
@@ -73,8 +73,6 @@ class ConversationApi(WebApiResource):
             ConversationService.delete(app_model, conversation_id, end_user)
         except ConversationNotExistsError:
             raise NotFound("Conversation Not Exists.")
-        WebConversationService.unpin(app_model, conversation_id, end_user)
-
         return {"result": "success"}, 204
 
 
diff --git a/api/core/rag/extractor/blob/blob.py b/api/core/rag/extractor/blob/blob.py
index 01003a13b..60dbc449f 100644
--- a/api/core/rag/extractor/blob/blob.py
+++ b/api/core/rag/extractor/blob/blob.py
@@ -107,7 +107,7 @@ class Blob(BaseModel):
             Blob instance
         """
         if mime_type is None and guess_type:
-            _mimetype = mimetypes.guess_type(path)[0] if guess_type else None
+            _mimetype = mimetypes.guess_type(path)[0]
         else:
             _mimetype = mime_type
         # We do not load the data immediately, instead we treat the blob as a