SQL错误提示

系统:PHP 7.1.29 (Linux)
sql错误:SELECT * FROM sky_mod_down_group where gid= LIMIT 0,1 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 'LIMIT 0,1' at line 1
/www/wwwroot/www.deituicms.com/skymvc/class/cls_mysqli.php:298行,调用方法:query
/www/wwwroot/www.deituicms.com/skymvc/class/cls_mysqli.php:223行,调用方法:getRow
/www/wwwroot/www.deituicms.com/skymvc/class/cls_model.php:138行,调用方法:selectRow
/www/wwwroot/www.deituicms.com/module/down/source/index/down.ctrl.php:166行,调用方法:selectRow
/www/wwwroot/www.deituicms.com/skymvc/skymvc.php:356行,调用方法:onShow
/www/wwwroot/www.deituicms.com/module.php:66行,调用方法:require
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