diff --git a/recbole/model/general_recommender/line.py b/recbole/model/general_recommender/line.py
index 7c183c2f4..9a7fbf9f3 100644
--- a/recbole/model/general_recommender/line.py
+++ b/recbole/model/general_recommender/line.py
@@ -69,7 +69,7 @@ def __init__(self, config, dataset):
 
     def get_used_ids(self):
         cur = np.array([set() for _ in range(self.n_items)])
-        for iid, uid in zip(self.interaction_feat[self.USER_ID].numpy(), self.interaction_feat[self.ITEM_ID].numpy()):
+        for uid, iid in zip(self.interaction_feat[self.USER_ID].numpy(), self.interaction_feat[self.ITEM_ID].numpy()):
             cur[iid].add(uid)
         return cur