diff --git a/metagpt/ext/cr/actions/code_review.py b/metagpt/ext/cr/actions/code_review.py
index db9893aee..ae6086f11 100644
--- a/metagpt/ext/cr/actions/code_review.py
+++ b/metagpt/ext/cr/actions/code_review.py
@@ -166,6 +166,8 @@ class CodeReview(Action):
     async def cr_by_points(self, patch: PatchSet, points: list[Point]):
         comments = []
         for patched_file in patch:
+            if not patched_file:
+                continue
             if patched_file.path.endswith(".py"):
                 points = [p for p in points if p.language == "Python"]
             elif patched_file.path.endswith(".java"):
@@ -180,10 +182,11 @@ class CodeReview(Action):
                 resp = await self.llm.aask(prompt)
                 json_str = parse_json_code_block(resp)[0]
                 comments_batch = json.loads(json_str)
-                patched_file_path = patched_file.path
-                for c in comments_batch:
-                    c["commented_file"] = patched_file_path
-                comments += comments_batch
+                if comments_batch:
+                    patched_file_path = patched_file.path
+                    for c in comments_batch:
+                        c["commented_file"] = patched_file_path
+                    comments += comments_batch
 
         return comments
 
diff --git a/metagpt/tools/libs/cr.py b/metagpt/tools/libs/cr.py
index f802af620..ea6acf654 100644
--- a/metagpt/tools/libs/cr.py
+++ b/metagpt/tools/libs/cr.py
@@ -30,7 +30,7 @@ class CodeReview:
         Args:
             patch_path: The local path of the patch file or the url of the pull request. Example: "/data/xxx-pr-1.patch", "https://github.com/xx/XX/pull/1362"
             cr_output_file: Output file path where code review comments will be saved. Example: "cr/xxx-pr-1.json"
-            cr_point_file: File path for specifying code review points. Set `None` to use a predefined file.
+            cr_point_file: File path for specifying code review points. If not specified, this parameter is not passed..
         """
         patch = await self._get_patch_content(patch_path)
         cr_point_file = cr_point_file if cr_point_file else Path(metagpt.ext.cr.__file__).parent / "points.json"