mysqlprocgrep ERROR: Unread result found

[slowtech]

Here it it,

without "--kill-connection" it's working ok,

[root@node1 ~]# mysqlprocgrep --server=root:123456@localhost --match-command=Query --age=40s
WARNING: Using a password on the command line interface can be insecure.
+------------------------+-------+-------+------------+-------+----------+-------+-------------+-----------------------+
| Connection | Id | User | Host | Db | Command | Time | State | Info |
+------------------------+-------+-------+------------+-------+----------+-------+-------------+-----------------------+
| root:@localhost:3306 | 1670 | root | localhost | None | Query | 554 | User sleep | select sleep(100000) |
| root:@localhost:3306 | 1671 | root | localhost | None | Query | 521 | User sleep | select sleep(10000) |
+------------------------+-------+-------+------------+-------+----------+-------+-------------+-----------------------+

And I tried to kill the connection,it produced error

[root@node1 ~]# mysqlprocgrep --server=root:123456@localhost --match-command=Query --age=40s --kill-connection
WARNING: Using a password on the command line interface can be insecure.
ERROR: Unread result found