getting error message doing backup from mariadb 5.5.64

[nugrahadi]

because I'm not sure whether to write it as an issue or not, so I'll write it here first.

I have a problem backing up a database server, it has this error log

Backup failed: mariadb-dump: Couldn't execute 'select column_name, extra, generation_expression, data_type from information_schema.columns where table_schema=database() and table_name='access_keys' order by ordinal_position': Unknown column 'generation_expression' in 'field list' (1054)

already tried using --column-statistics=0 and --compact but the error still exist

database server version is mariadb-5.5.64. any suggestion?