[PrestaShopDatabaseException]

Unknown column 'tag' in 'where clause'

SELECT * FROM ps_smart_blog_post p INNER JOIN 
                ps_smart_blog_post_lang pl ON p.id_smart_blog_post=pl.id_smart_blog_post INNER JOIN 
                ps_smart_blog_post_shop ps ON pl.id_smart_blog_post = ps.id_smart_blog_post 
                WHERE pl.id_lang=5
                AND p.active= 1 AND p.id_smart_blog_post = tag

at line 792 in file classes/db/Db.php

787.         if ($webservice_call && $errno) {
788.             $dbg = debug_backtrace();
789.             WebserviceRequest::getInstance()->setError(500, '[SQL Error] '.$this->getMsgError().'. From '.(isset($dbg[3]['class']) ? $dbg[3]['class'] : '').'->'.$dbg[3]['function'].'() Query was : '.$sql, 97);
790.         } elseif (_PS_DEBUG_SQL_ && $errno && !defined('PS_INSTALLATION_IN_PROGRESS')) {
791.             if ($sql) {
792.                 throw new PrestaShopDatabaseException($this->getMsgError().'<br /><br /><pre>'.$sql.'</pre>');
793.             }
794. 
795.             throw new PrestaShopDatabaseException($this->getMsgError());
796.         }
797.     }