diff --git a/campaign/event_20210722_cn/campaign_base.py b/campaign/event_20210722_cn/campaign_base.py
index 3055f23d7..c0400be60 100644
--- a/campaign/event_20210722_cn/campaign_base.py
+++ b/campaign/event_20210722_cn/campaign_base.py
@@ -38,8 +38,7 @@ class CampaignBase(CampaignBase_):
         elif name[-1].isdigit():
             return name[:-1], name[-1]
 
-        logger.warning(f'Unknown stage name: {name}')
-        return name[0], name[1:]
+        return CampaignBase_._campaign_separate_name(name)
 
     @staticmethod
     def _campaign_get_chapter_index(name):
diff --git a/module/campaign/campaign_ocr.py b/module/campaign/campaign_ocr.py
index 39ad4ad32..637481d7c 100644
--- a/module/campaign/campaign_ocr.py
+++ b/module/campaign/campaign_ocr.py
@@ -73,7 +73,7 @@ class CampaignOcr(ModuleBase):
             return '', ''
 
         logger.warning(f'Unknown stage name: {name}')
-        return name[0], name[1:]
+        return '', ''
 
     def campaign_match_multi(self, template, image, stage_image=None, name_offset=(75, 9), name_size=(60, 16),
                              name_letter=(255, 255, 255), name_thresh=128, similarity=0.85):