SQL错误提示

系统:PHP 7.2.15 (Linux)
sql错误:SELECT * FROM sky_imgs where object_id= LIMIT 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 1' at line 1
/data/www/default/axjf/skymvc/class/cls_pdo.php:256行,调用方法:query
/data/www/default/axjf/skymvc/class/cls_pdo.php:190行,调用方法:getRow
/data/www/default/axjf/skymvc/class/cls_model.php:137行,调用方法:selectRow
/data/www/default/axjf/source/shoujiadmin/zu.ctrl.php:37行,调用方法:selectRow
/data/www/default/axjf/skymvc/skymvc.php:204行,调用方法:onDefault
/data/www/default/axjf/shoujiadmin.php:24行,调用方法:require
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