Concat two columns from different MySQL tables -

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i trying concat list of usernames 1 column in mysql. 2 lists of usernames coming 2 different tables. 

(select cast(group_concat(concat(usr.username, ' ' ,cc.username)separator ',') char(200)) messagejobrecipients mr         left join chatusers cur on mr.chatuserid = cur.id          left join users usr on cur.tableuserid=usr.user_id         left join customer_contacts cc on cur.tableuserid=cc.id         jobid = j.id) membersincluded

the code works fine if try display concat(usr.username) or concat(cc.username) when try display both concat(usr.username, ' ' ,cc.username) returns null.


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