MySQL Fatal Error

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

The Error returned was:
Illegal argument to a regular expression.

Error Number:
3685

SELECT `id` FROM `cartage_org` where `action` = '0' and `cat` regexp '[[:<:]](64)[[:>:]]'

MySQL.v : 8.0.44-0ubuntu0.24.04.2
PHP.v : 5.6.40
Script : /salon/maruti/
Refer :