Uncaught Exception: SqlException

Message:
invalid query:SELECT category_table,cat_name from category WHERE category_id= 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 '' at line 1
Created in file /var/www/vhosts/zeelists.com/httpdocs/usol/lib/database/SqlDatabaseManager.class.php on line 141.

Stack Trace:
#0 /var/www/vhosts/zeelists.com/httpdocs/protected/appcode/datamanager/PostDataManager.class.php(162): SqlDatabaseManager->executeQuery('SELECT category...')
#1 /var/www/vhosts/zeelists.com/httpdocs/protected/classes/SearchJobs.class.php(30): PostDataManager->getCategoryName('')
#2 /var/www/vhosts/zeelists.com/httpdocs/protected/pages/search.php(66): SearchJobs->load('', '9')
#3 [internal function]: search->category('', '9')
#4 /var/www/vhosts/zeelists.com/httpdocs/usol/lib/RegisterCallback.class.php(8): call_user_func_array(Array, Array)
#5 /var/www/vhosts/zeelists.com/httpdocs/usol/lib/Application.class.php(47): RegisterCallback::register(Object(search), 'category', Array)
#6 /var/www/vhosts/zeelists.com/httpdocs/index.php(12): Application::run(Object(HttpRequest))
#7 {main}
6.
In file /var/www/vhosts/zeelists.com/httpdocs/protected/appcode/datamanager/PostDataManager.class.php line 162.
Method: SqlDatabaseManager->executeQuery([$query FILTERED])
5.
In file /var/www/vhosts/zeelists.com/httpdocs/protected/classes/SearchJobs.class.php line 30.
Method: PostDataManager->getCategoryName([$category_id FILTERED])
4.
In file /var/www/vhosts/zeelists.com/httpdocs/protected/pages/search.php line 66.
Method: SearchJobs->load([$cId FILTERED], [$city_id FILTERED])
3.
In file unknown line unknown.
Method: search->category([$cId FILTERED], [$cityId FILTERED])
2.
In file /var/www/vhosts/zeelists.com/httpdocs/usol/lib/RegisterCallback.class.php line 8.
Method: call_user_func_array([$function_name FILTERED], [$parameters FILTERED])
1.
In file /var/www/vhosts/zeelists.com/httpdocs/usol/lib/Application.class.php line 47.
Method: RegisterCallback::register([$class FILTERED], [$funcName FILTERED], [$args FILTERED])
0.
In file /var/www/vhosts/zeelists.com/httpdocs/index.php line 12.
Method: Application::run([$request FILTERED])