diff --git a/api/controllers/web/conversation.py b/api/controllers/web/conversation.py
index bf197a6601..541975aade 100644
--- a/api/controllers/web/conversation.py
+++ b/api/controllers/web/conversation.py
@@ -2,7 +2,7 @@ from typing import Literal
 
 from flask import request
 from flask_restx import fields, marshal_with
-from pydantic import BaseModel, Field, field_validator
+from pydantic import BaseModel, Field, field_validator, model_validator
 from sqlalchemy.orm import Session
 from werkzeug.exceptions import NotFound
 
@@ -38,6 +38,13 @@ class ConversationRenamePayload(BaseModel):
     name: str | None = None
     auto_generate: bool = False
 
+    @model_validator(mode="after")
+    def validate_name_requirement(self):
+        if not self.auto_generate:
+            if self.name is None or not self.name.strip():
+                raise ValueError("name is required when auto_generate is false")
+        return self
+
 
 register_schema_models(web_ns, ConversationListQuery, ConversationRenamePayload)