diff --git a/medredis.c b/medredis.c
index ef1dcfb..51b6837 100644
--- a/medredis.c
+++ b/medredis.c
@@ -572,6 +572,7 @@ int medredis_fetch_records(med_callid_t *callid,
             goto err;
         }
         free(cid);
+        cids[i] = NULL;
     }
 
     for (i = 0; i < 3; ++i) {