diff --git a/gather_new_user.py b/gather_new_user.py
index 98c98cf..3df950b 100644
--- a/gather_new_user.py
+++ b/gather_new_user.py
@@ -22,11 +22,12 @@ def get_last_time(gameid, channelid, ad_channel):
     where
         gameid={gameid} 
         and channelid={channelid} 
-        and ad_channel={ad_channel}      
+        and ad_channel='{ad_channel}'      
     ORDER BY
         register_time DESC      LIMIT 1"""
     data = mydb.query(sql)
     try:
+        pdb.set_trace()
         last_time = data[0][0]
     except Exception:
         log.info("get last time form db failed!", exc_info=True)