No error pops up in Navicat when selecting roles.

SELECT fdwname AS name, fdwacl AS acl FROM pg_foreign_data_wrapper WHERE fdwacl::VARCHAR LIKE '%admin%'

I180409 23:48:05.179837 8072 sql/conn_executor.go:1805 [n1,client=[::1]:59064,user=root] execution error: invalid cast: string[] -> VARCHAR