MySQL Fatal Error

MySQL Error!
--------------------------

The Error returned was:
Got error 'invalid UTF-8 string at offset 2' from regexp

Error Number:
1139

SELECT `id` FROM `xc_org` where `action` = '0' and xc_org.company REGEXP("^[�]")

MySQL.v : 5.5.5-10.1.43-MariaDB
PHP.v : 5.6.40
Script : /salon/az/?lit=198
Refer : http://r93.ru/salon/az/?lit=198