diff --git a/src/tools/sync_db.py b/src/tools/sync_db.py
index fb32b82..15dfaad 100644
--- a/src/tools/sync_db.py
+++ b/src/tools/sync_db.py
@@ -231,7 +231,7 @@ def generate_union_table(mysql_conn):
                     if not matched:
                         # 否则匹配第一个未匹配过的
                         for idx in set_idx:
-                            if stash_data[idx]['code'].lower() in whisper_codes:
+                            if stash_data[idx]['code'] and stash_data[idx]['code'].lower() in whisper_codes:
                                 continue
                             if not stash_data[idx].get('matched', False):
                                 s = stash_data[idx]