Undefined variable $vi_link_tid

/data/v5.k404.net/cell/head/m_nav/nav/panel/inc/panel_lang.php - 16

ERROR!

mysqli_sql_exception: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'and lang=ud.lang_iso limit 1) as url, (SELECT klocal FROM `vi_lang`' at line 2 in /data/v5.k404.net/admin888/lib/vi_mysql_class.php:93 Stack trace: #0 /data/v5.k404.net/admin888/lib/vi_mysql_class.php(93): mysqli->query() #1 /data/v5.k404.net/admin888/lib/vi_mysql_class.php(241): VI_mysql_class->query() #2 /data/v5.k404.net/cell/head/m_nav/nav/panel/inc/panel_lang.php(20): VI_mysql_class->getRows() #3 /data/v5.k404.net/cell/head/m_nav/nav/panel/panel_01.php(20): require('...') #4 /data/v5.k404.net/cell/head/m_nav/nav/f3.php(18): require('...') #5 /data/v5.k404.net/cell/head/m_nav/switch.php(5): require('...') #6 /data/v5.k404.net/cell/head/head98/h20/in38/head1/head.php(36): require('...') #7 /data/v5.k404.net/cell/head/head.php(14): require('...') #8 /data/v5.k404.net/cell/not_found.php(5): require('...') #9 /data/v5.k404.net/index.php(274): require('...') #10 /data/v5.k404.net/admin888/core.class.php(75): imb_def() #11 /data/v5.k404.net/global.php(58): ImbCMS_class->pageEngine() #12 /data/v5.k404.net/global.php(2): sg_load() #13 /data/v5.k404.net/index.php(3): require_once('...') #14 {main}SELECT kcode,lang_iso as lang , (SELECT url FROM `uii_link` where siteid=1110 and link_type=51 and tid= and lang=ud.lang_iso limit 1) as url, (SELECT klocal FROM `vi_lang` where ud.lang_iso=lang_iso limit 1) as klocal FROM `uii_lang` as ud where siteid=1110

ERROR:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'and lang=ud.lang_iso limit 1) as url, (SELECT klocal FROM `vi_lang`' at line 2