diff --git a/src/com/hellogithub/dao/UserDao.java b/src/com/hellogithub/dao/UserDao.java
index 4f2a7ce..46aad93 100644
--- a/src/com/hellogithub/dao/UserDao.java
+++ b/src/com/hellogithub/dao/UserDao.java
@@ -131,6 +131,7 @@ public class UserDao {
             String sql = "select searchHistory from user where userName=? and isValid = 1";
             userEntity  = runner.query(conn, sql, new BeanHandler<>(userEntity.class),name);
             l = userEntity.getSearchHistory().split(";");
+
             for(int i=0;i<l.length;i++)
             {
                 if(l[i].equals(str))
@@ -140,6 +141,10 @@ public class UserDao {
                 }
             }
             label = String.join(";",l)+";";
+            if(l.length == 1)
+            {
+                label="";
+            }
             sql="UPDATE user SET searchHistory = ? WHERE userName= ?";
             num = runner.update(conn,sql,label,name);
         } catch (SQLException e) {