diff --git a/src/plugins/nonebot_hk_reporter/platform/weibo.py b/src/plugins/nonebot_hk_reporter/platform/weibo.py
index 227bf2a..e3a27c4 100644
--- a/src/plugins/nonebot_hk_reporter/platform/weibo.py
+++ b/src/plugins/nonebot_hk_reporter/platform/weibo.py
@@ -117,3 +117,4 @@ class Weibo(NewMessage, TargetMixin):
         detail_url = 'https://weibo.com/{}/{}'.format(info['user']['id'], info['bid'])
         # return parsed_text, detail_url, pic_urls
         return Post('weibo', text=parsed_text, url=detail_url, pics=pic_urls, target_name=info['user']['screen_name'])
+
diff --git a/src/plugins/nonebot_hk_reporter/post.py b/src/plugins/nonebot_hk_reporter/post.py
index d101e7b..862c086 100644
--- a/src/plugins/nonebot_hk_reporter/post.py
+++ b/src/plugins/nonebot_hk_reporter/post.py
@@ -21,7 +21,7 @@ class Post:
     target_name: Optional[str] = None
     compress: bool = False
     override_use_pic: Optional[bool] = None
-    pics: list[Union[str,bytes]] = field(default_factory=list)
+    pics: Union[list[Union[str,bytes]], list[str], list[bytes]] = field(default_factory=list)
     extra_msg: list[Message] = field(default_factory=list)
 
     _message: Optional[list] = None
@@ -66,6 +66,8 @@ class Post:
             x_coord.append(_tmp)
         y_coord = [0, first_image.size[1]]
         async def process_row(row: int) -> bool:
+            if len(self.pics) < (row + 1) * 3:
+                return False
             row_first_img = await self._pic_url_to_image(self.pics[row * 3])
             if not self._check_image_square(row_first_img.size):
                 return False
diff --git a/tests/test_merge_pic.py b/tests/test_merge_pic.py
index 10960b1..9aeb5ec 100644
--- a/tests/test_merge_pic.py
+++ b/tests/test_merge_pic.py
@@ -40,3 +40,15 @@ async def test_3_merge(plugin_module):
     post = plugin_module.post.Post('', '', '', pics=merge_source_9[0:3]+merge_source_9[9:])
     await post._pic_merge() 
     assert len(post.pics) == 5
+
+@pytest.mark.asyncio
+async def test_6_merge_only(plugin_module):
+    post = plugin_module.post.Post('', '', '', pics=merge_source_9[0:6])
+    await post._pic_merge() 
+    assert len(post.pics) == 1
+
+@pytest.mark.asyncio
+async def test_3_merge_only(plugin_module):
+    post = plugin_module.post.Post('', '', '', pics=merge_source_9[0:3])
+    await post._pic_merge() 
+    assert len(post.pics) == 1