diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 60e7c18..3b2c213 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -13,7 +13,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: ["3.8", "3.9"]
+        python-version: ["3.9"]
         os: [ubuntu-latest]
         include:
           - python-version: "3.8"
diff --git a/.gitignore b/.gitignore
index eb3c126..29b76ec 100644
--- a/.gitignore
+++ b/.gitignore
@@ -112,4 +112,5 @@ ENV/
 .idea/
 
 requests
-responses
\ No newline at end of file
+responses
+.DS_Store
\ No newline at end of file
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index bdf4f4d..68ce2f1 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -8,7 +8,7 @@ You can contribute in many ways:
 
 ### Report Bugs
 
-Report bugs at https://github.com/cubenlp/chatapi_toolkit/issues.
+Report bugs at https://github.com/cubenlp/chattool/issues.
 
 If you are reporting a bug, please include:
 
@@ -32,7 +32,7 @@ articles, and such.
 
 ### Submit Feedback
 
-The best way to send feedback is to file an issue at https://github.com/cubenlp/chatapi_toolkit/issues.
+The best way to send feedback is to file an issue at https://github.com/cubenlp/chattool/issues.
 
 If you are proposing a feature:
 
@@ -93,7 +93,7 @@ Before you submit a pull request, check that it meets these guidelines:
 
 1. The pull request should include tests.
 2. If the pull request adds functionality, the docs should be updated. Put your new functionality into a function with a docstring, and add the feature to the list in README.rst.
-3. The pull request should work for Python 3.8 and 3.9, and for PyPy. Check https://github.com/cubenlp/chatapi_toolkit/actions and make sure that the tests pass for all supported Python versions.
+3. The pull request should work for Python 3.8 and 3.9, and for PyPy. Check https://github.com/cubenlp/chattool/actions and make sure that the tests pass for all supported Python versions.
 
 ## Tips
 
diff --git a/README.md b/README.md
index 2e1b5a4..80e2206 100644
--- a/README.md
+++ b/README.md
@@ -2,9 +2,9 @@
 
 # ChatAPI Toolkit
 [![PyPI version](https://img.shields.io/pypi/v/chattool.svg)](https://pypi.python.org/pypi/chattool)
-[![Tests](https://github.com/cubenlp/chatapi_toolkit/actions/workflows/test.yml/badge.svg)](https://github.com/cubenlp/chatapi_toolkit/actions/workflows/test.yml/)
+[![Tests](https://github.com/cubenlp/chattool/actions/workflows/test.yml/badge.svg)](https://github.com/cubenlp/chattool/actions/workflows/test.yml/)
 [![Documentation Status](https://img.shields.io/badge/docs-github_pages-blue.svg)](https://chattool.cubenlp.com)
-[![Coverage](https://codecov.io/gh/cubenlp/chatapi_toolkit/branch/master/graph/badge.svg)](https://codecov.io/gh/cubenlp/chatapi_toolkit)
+[![Coverage](https://codecov.io/gh/cubenlp/chattool/branch/master/graph/badge.svg)](https://codecov.io/gh/cubenlp/chattool)
 
 <!-- 
 [![Updates](https://pyup.io/repos/github/cubenlp/chattool/shield.svg)](https://pyup.io/repos/github/cubenlp/chattool/) 
diff --git a/README_zh_CN.md b/README_zh_CN.md
index e632790..31a879b 100644
--- a/README_zh_CN.md
+++ b/README_zh_CN.md
@@ -1,8 +1,8 @@
 # ChatAPI Toolkit
 [![PyPI version](https://img.shields.io/pypi/v/chattool.svg)](https://pypi.python.org/pypi/chattool)
-[![Tests](https://github.com/cubenlp/chatapi_toolkit/actions/workflows/test.yml/badge.svg)](https://github.com/cubenlp/chatapi_toolkit/actions/workflows/test.yml/)
+[![Tests](https://github.com/cubenlp/chattool/actions/workflows/test.yml/badge.svg)](https://github.com/cubenlp/chattool/actions/workflows/test.yml/)
 [![Documentation Status](https://img.shields.io/badge/docs-github_pages-blue.svg)](https://apicall.wzhecnu.cn)
-[![Coverage](https://codecov.io/gh/cubenlp/chatapi_toolkit/branch/master/graph/badge.svg)](https://codecov.io/gh/cubenlp/chatapi_toolkit)
+[![Coverage](https://codecov.io/gh/cubenlp/chattool/branch/master/graph/badge.svg)](https://codecov.io/gh/cubenlp/chattool)
 
 <!-- 
 [![Updates](https://pyup.io/repos/github/cubenlp/chattool/shield.svg)](https://pyup.io/repos/github/cubenlp/chattool/) 
diff --git a/chattool/__init__.py b/chattool/__init__.py
index 13307d4..2f9096f 100644
--- a/chattool/__init__.py
+++ b/chattool/__init__.py
@@ -2,7 +2,7 @@
 
 __author__ = """Rex Wang"""
 __email__ = '1073853456@qq.com'
-__version__ = '2.4.2'
+__version__ = '2.5.0'
 
 import os, sys, requests
 from .chattool import Chat, Resp
diff --git a/chattool/chattool.py b/chattool/chattool.py
index 189c03c..71f5338 100644
--- a/chattool/chattool.py
+++ b/chattool/chattool.py
@@ -226,7 +226,7 @@ async def async_stream_responses(self, timeout:int=0, textonly:bool=False):
 
         Args:
             timeout (int, optional): timeout for the API call. Defaults to 0(no timeout).
-            textonly (bool, optional): whether to only return the text. Defaults to True.
+            textonly (bool, optional): whether to only return the text. Defaults to False.
         
         Returns:
             str: response text
@@ -242,11 +242,18 @@ async def async_stream_responses(self, timeout:int=0, textonly:bool=False):
                 while True:
                     line = await response.content.readline()
                     if not line: break
+                    # strip the prefix of `data: {...}`
                     strline = line.decode().lstrip('data:').strip()
+                    # skip empty line
                     if not strline: continue
+                    # read the json string
                     line = json.loads(strline)
+                    # wrap the response
                     resp = Resp(line)
+                    # stop if the response is finished
                     if resp.finish_reason == 'stop': break
+                    # deal with the message
+                    if 'content' not in resp.delta: continue
                     if textonly:
                         yield resp.delta_content
                     else:
diff --git a/chattool/checkpoint.py b/chattool/checkpoint.py
index 3788539..7ae80be 100644
--- a/chattool/checkpoint.py
+++ b/chattool/checkpoint.py
@@ -9,7 +9,7 @@ def load_chats( checkpoint:str
     
     Args:
         checkpoint (str): path to the checkpoint file
-        withid (bool, optional): whether the checkpoint file contains chatid. Defaults to False.
+        withid (bool, optional): Deprecated. It is not needed anymore. Defaults to False.
 
     Returns:
         list: chats
@@ -27,7 +27,7 @@ def load_chats( checkpoint:str
     # get the chatlogs
     logs = [json.loads(txt) for txt in txts]
     ## chatlogs with chatid
-    if withid:
+    if 'chatid' in logs[0]:
         chat_size, chatlogs = 1, [None]
         for log in logs:
             idx = log['chatid']
@@ -35,6 +35,9 @@ def load_chats( checkpoint:str
                 chatlogs.extend([None] * (idx - chat_size + 1))
                 chat_size = idx + 1
             chatlogs[idx] = log['chatlog']
+        # check if there are missing chatlogs
+        if None in chatlogs:
+            warnings.warn(f"checkpoint file {checkpoint} has unfinished chats")
     else: ## logs without chatid
         chatlogs = logs
     # return Chat class
diff --git a/chattool/response.py b/chattool/response.py
index 53de20d..cd67a62 100644
--- a/chattool/response.py
+++ b/chattool/response.py
@@ -69,10 +69,15 @@ def function_call(self):
         """Function call"""
         return self.message['function_call']
     
+    @property
+    def delta(self):
+        """Delta"""
+        return self.response['choices'][0]['delta']
+    
     @property
     def delta_content(self):
         """Content of stream response"""
-        return self.response['choices'][0]['delta']['content']
+        return self.delta['content']
     
     @property
     def object(self):
diff --git a/setup.py b/setup.py
index 2b0bbcd..13ab5c1 100644
--- a/setup.py
+++ b/setup.py
@@ -7,7 +7,7 @@
 with open('README.md') as readme_file:
     readme = readme_file.read()
 
-VERSION = '2.4.2'
+VERSION = '2.5.0'
 
 requirements = [
     'Click>=7.0', 'requests>=2.20', "responses>=0.23",
@@ -43,7 +43,7 @@
     packages=find_packages(include=['chattool', 'chattool.*']),
     test_suite='tests',
     tests_require=test_requirements,
-    url='https://github.com/cubenlp/chatapi_toolkit',
+    url='https://github.com/cubenlp/chattool',
     version=VERSION,
     zip_safe=False,
 )
diff --git a/tests/test_finetune.py b/tests/test_finetune.py
index a5725a0..9554846 100644
--- a/tests/test_finetune.py
+++ b/tests/test_finetune.py
@@ -29,13 +29,14 @@ def test_finetune():
     # get job list
     jobs = ft.list_jobs()
     jobs = ft.list_jobs(limit=1)
-    jobid = jobs[0]['id']
-    # TODO: create job/cancel job/delete job
-    # retrieve job
-    ft.retrieve_job(jobid)
-    # list events
-    ft.list_events(jobid)
-    ft.list_events(jobid, limit=20)
+    if len(jobs):
+        jobid = jobs[0]['id']
+        # TODO: create job/cancel job/delete job
+        # retrieve job
+        ft.retrieve_job(jobid)
+        # list events
+        ft.list_events(jobid)
+        ft.list_events(jobid, limit=20)
     # default repl
     print(ft)
     # get model list