emysql_tcp:response_list/4 miss match some binary packet when using emysql_conn:unprepare/2

[dogtapdsd]

error info like this:
{function_clause,[{emysql_tcp,response_list,[#Port<0.136042>,8000,0,<<7,0,0,1,0,0,0,2,0,0,0>>],[{file,[115,114,99,47,109,121,115,113,108,47,101,109,121,115,113,108,47,101,109,121,115,113,108,95,116,99,112,46,101,114,108]},{line,58}]},{emysql_tcp,response_list,4,[{file,[115,114,99,47,109,121,115,113,108,47,101,109,121,115,113,108,47,101,109,121,115,113,108,95,116,99,112,46,101,114,108]},{line,63}]},{emysql_tcp,send_and_recv_packet,3,[{file,[115,114,99,47,109,121,115,113,108,47,101,109,121,115,113,108,47,101,109,121,115,113,108,95,116,99,112,46,101,114,108]},{line,47}]},{emysql_conn,send_recv,2,[{file,[115,114,99,47,109,121,115,113,108,47,101,109,121,115,113,108,47,101,109,121,115,113,108,95,99,111,110,110,46,101,114,108]},{line,351}]},

mysql version was 5.6.13