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Database Exceptionyii\db\Exception

SQLSTATE[42000]: Syntax error or access violation: 1064 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 ') and is_del=0 ORDER BY `id` DESC' at line 1
The SQL being executed was: SELECT * FROM `course` WHERE online=1 and (tname = '' or lecturer_id = ) and is_del=0 ORDER BY `id` DESC

Error Info: Array
(
    [0] => 42000
    [1] => 1064
    [2] => 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 ') and is_del=0 ORDER BY `id` DESC' at line 1
)