Fatal error: Call to a member function fetch_assoc()

Fatal error: Call to a member function fetch_assoc() on a non-object in /home/www/fv.cz/_ssl/www/my.adm/adminer-2.3.2.php on line 528
table struct:

-- Adminer 2.3.2 dump
SET NAMES utf8;
SET foreign_key_checks = 0;
SET time_zone = 'SYSTEM';
SET sql_mode = 'NO_AUTO_VALUE_ON_ZERO';

DROP TABLE IF EXISTS `_log`;
CREATE TABLE `_log` (
`date` datetime NOT NULL,
`session` varchar(32) collate utf8_czech_ci NOT NULL,
`ip` varchar(39) collate utf8_czech_ci default NULL,
`app` varchar(16) collate utf8_czech_ci default NULL,
`table` varchar(32) collate utf8_czech_ci default NULL,
`table_id` int(10) unsigned default NULL,
`msg` varchar(255) collate utf8_czech_ci default NULL,
`iduser` int(10) unsigned default NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_czech_ci;

link: https://xxx/adminer/?server=localhost&db=xxxxx&edit=_log&where%5Bdate%5D=2010-06-06+16%3A45%3A58&where%5Bsession%5D=&null%5B%5D=ip&where%5Bapp%5D=%3Ccore%3E&null%5B%5D=table&null%5B%5D=table_id&where%5Bmsg%5D=RotationFirmModel%3A%3AgetCombinations%3B+cats+is+not+an+array+or+is+empty%21+falling+into%3A+CategoryModel%3A%3AID_TOP_LEVEL&null%5B%5D=iduser

if i want to click on "update/upravit" then show fatal error