result error: 
MDB2 Error: unknown error
_doQuery: [Error message: Could not execute statement]
[Last executed query:  SELECT
                    
                    SQL_CALC_FOUND_ROWS
                    `PRT_PARTNERS`.`ID`,
                    `PRT_PARTNERS`.`TYPE`,         
                    `PRT_PARTNERS`.`STATUS`,  
                    `PRT_PARTNERS`.`CATEG`,  
                    `PRT_PARTNERS`.`AGENT_ID`,
                    `PRT_PARTNERS`.`NAME`,
                    `PRT_PARTNERS`.`AC_NAME`,
                    `PRT_PARTNERS`.`CONTACT1`,
                    `PRT_PARTNERS`.`CONTACT2`,
                    `PRT_PARTNERS`.`OWNER`,
                    `PRT_PARTNERS`.`WEB1`,
                    `PRT_PARTNERS`.`WEB2`,
                    `PRT_PARTNERS`.`BRANDS`,
                    `PRT_PARTNERS`.`LOGO`,
                    `PRT_PARTNERS`.`PHONE1`,
                    `PRT_PARTNERS`.`PHONE2`,
                    `PRT_PARTNERS`.`SHOW_PHONE`,
                    `PRT_PARTNERS`.`MOBILE1`,
                    `PRT_PARTNERS`.`MOBILE2`,
                    `PRT_PARTNERS`.`SHOW_MOBILE`,
                    `PRT_PARTNERS`.`FAX1`,
                    `PRT_PARTNERS`.`FAX2`,
                    `PRT_PARTNERS`.`EMAIL1`,
                    `PRT_PARTNERS`.`EMAIL2`,
                    `PRT_PARTNERS`.`TAX_ID`,
                    `PRT_PARTNERS`.`EU_TAX_ID`,
                    `PRT_PARTNERS`.`REG_ID`,
                    `PRT_PARTNERS`.`BANK_ID`,
                    `PRT_PARTNERS`.`COMMENT`,
                    `PRT_PARTNERS`.`NOCALL`,
                    `PRT_PARTNERS`.`NOCALL_DATE`,
                    `PRT_PARTNERS`.`URL_FRIENDLY`,
                    `PRT_PARTNERS`.`CHECK`,
                    `PRT_PARTNERS`.`MOBILAPP_IS_VISIBLE`,
                    `PRT_PARTNERS`.`MOBILAPP_VIEWED_COUNT`,
                    `PRT_PARTNERS`.`DESC`,
                    
                    `SYS_USERS`.`REALNAME` AS `AGENT_NAME`,
                    
                    `PRT_PARTNERS_AUTH`.`USERNAME` AS `AUTH_USERNAME`,
                    `PRT_PARTNERS_AUTH`.`PASSWORD_CLR` AS `AUTH_PASSWORD`,
                    `PRT_PARTNERS_AUTH`.`ACTIVE` AS `AUTH_STATUS`,
                    
                    `PRT_PARTNERS_DELIVERY`.`NOTE_COURIER`,
                    DATE_FORMAT(`PRT_PARTNERS_DELIVERY`.`DELIVERY_DATE`, '%Y.%m.%d') AS `DELIVERY_DATE`
                                                           
                    
                    
                 FROM 
                    PRT_PARTNERS
                    
                    LEFT JOIN `SYS_USERS`
                      ON ( `SYS_USERS`.`ID` = `PRT_PARTNERS`.`AGENT_ID` )

                    LEFT JOIN `PRT_PARTNERS_AUTH`
                      ON ( `PRT_PARTNERS_AUTH`.`PARTNER` = `PRT_PARTNERS`.`ID` )                        
                    
                    LEFT JOIN `PRT_PARTNERS_DELIVERY`
                      ON ( `PRT_PARTNERS_DELIVERY`.`PARTNER_ID` = `PRT_PARTNERS`.`ID` )                        
                  
                    
                 
                 WHERE
                    `PRT_PARTNERS`.`DELETED` = '0'
                    
                     AND ( `PRT_PARTNERS`.`TYPE` = '1' )  
        AND ( `PRT_PARTNERS`.`URL_FRIENDLY` = 'milan_pero' ) 
       AND ( `PRT_PARTNERS`.`TYPE` <> '2' ) 
                    
                    GROUP BY `PRT_PARTNERS`.`ID`
                 
                 ORDER BY
                    PRT_PARTNERS.`NAME` ASC
                LIMIT 0,20]
[Native code: 2006]
[Native message: MySQL server has gone away]