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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 '' at line 3
The SQL being executed was: SELECT distinct(c.sender_id), u.username, u.email, u.online FROM chat_message c
LEFT JOIN user u ON u.iduser = c.sender_id
WHERE receiver_id =

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 '' at line 3
)