Fatal error: Uncaught Error: Object of class BaseObject could not be converted to string in /volume1/classic/xe/classes/xml/xmlquery/argument/ConditionArgument.class.php on line 31

Error: Object of class BaseObject could not be converted to string in /volume1/classic/xe/classes/xml/xmlquery/argument/ConditionArgument.class.php on line 31

Call Stack:
    0.0000     362264   1. {main}() /volume1/classic/xe/index.php:0
    0.1301    2395880   2. ModuleHandler->procModule() /volume1/classic/xe/index.php:59
    0.1384    2538592   3. ModuleObject->proc() /volume1/classic/xe/classes/module/ModuleHandler.class.php:863
    0.1394    2539288   4. boardView->dispBoardTagList() /volume1/classic/xe/classes/module/ModuleObject.class.php:443
    0.1399    2550656   5. tagModel->getTagList($obj = class stdClass { public $list_count = 10000; public $module_srl = class BaseObject { public $error = 1064; public $message = 'You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near \'? and `mid` in (?)\' at line 1'; public $variables = [...]; public $httpStatusCode = NULL } }) /volume1/classic/xe/modules/board/board.view.php:618
    0.1457    2553648   6. executeQueryArray($query_id = 'tag.getTagList', $args = class stdClass { public $module_srl = class BaseObject { public $error = 1064; public $message = 'You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near \'? and `mid` in (?)\' at line 1'; public $variables = [...]; public $httpStatusCode = NULL }; public $list_count = 10000; public $count = NULL }, $arg_columns = ???) /volume1/classic/xe/modules/tag/tag.model.php:44
    0.1457    2553648   7. DB->executeQuery($query_id = 'tag.getTagList', $args = class stdClass { public $module_srl = class BaseObject { public $error = 1064; public $message = 'You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near \'? and `mid` in (?)\' at line 1'; public $variables = [...]; public $httpStatusCode = NULL }; public $list_count = 10000; public $count = NULL }, $arg_columns = NULL, $type = ???) /volume1/classic/xe/config/func.inc.php:222
    0.1460    2554736   8. DB->_executeQuery($cache_file = '/volume1/classic/xe/files/cache/queries/tag.getTagList.1.11.6.mysqli.cache.php', $source_args = class stdClass { public $module_srl = class BaseObject { public $error = 1064; public $message = 'You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near \'? and `mid` in (?)\' at line 1'; public $variables = [...]; public $httpStatusCode = NULL }; public $list_count = 10000; public $count = NULL }, $query_id = 'tag.getTagList', $arg_columns = NULL, $type = NULL) /volume1/classic/xe/classes/db/DB.class.php:563
    0.1461    2555512   9. include('/volume1/classic/xe/files/cache/queries/tag.getTagList.1.11.6.mysqli.cache.php') /volume1/classic/xe/classes/db/DB.class.php:621
    0.1461    2556024  10. ConditionArgument->__construct($name = 'module_srl', $value = class BaseObject { public $error = 1064; public $message = 'You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near \'? and `mid` in (?)\' at line 1'; public $variables = ['_query' => 'SELECT `module_srl`  FROM `xe_modules` as `modules`   WHERE `site_srl` = ? and `mid` in (?)    ', '_elapsed_time' => '0.00038']; public $httpStatusCode = NULL }, $operation = 'in') /volume1/classic/xe/files/cache/queries/tag.getTagList.1.11.6.mysqli.cache.php:7
    0.1461    2556024  11. str_replace($search = ' ', $replace = '', $subject = class BaseObject { public $error = 1064; public $message = 'You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near \'? and `mid` in (?)\' at line 1'; public $variables = ['_query' => 'SELECT `module_srl`  FROM `xe_modules` as `modules`   WHERE `site_srl` = ? and `mid` in (?)    ', '_elapsed_time' => '0.00038']; public $httpStatusCode = NULL }) /volume1/classic/xe/classes/xml/xmlquery/argument/ConditionArgument.class.php:31