diff --git a/ad_interface_tornado.py b/ad_interface_tornado.py
index 149f2e9..8709da9 100644
--- a/ad_interface_tornado.py
+++ b/ad_interface_tornado.py
@@ -137,7 +137,11 @@ class DispatchHandler(tornado.web.RequestHandler):
 					id_list = []
 					if limit < len(ids):
 						for i in range(limit):
-							id_list.append(my_redis.srandmember(key))
+							while 1:
+								new = my_redis.srandmember(key)
+								if new not in id_list:
+									id_list.append(new)
+									break
 					for id in id_list:
 						temp = my_redis.hgetall(f"ad::{id}::info")
 						info.append(temp)