Knex:warning - migration file "null" failed

[capaj]

when a migration fails before any migration file, this slightly confusing warning is logged into the console.
this was the full log:

Knex:warning - migration file "null" failed
Knex:warning - Can't take lock to run migrations: Migration table is already locked
Knex:warning - If you are sure migrations are not running you can release the lock manually by deleting all the rows from migrations lock table: knex_migrations_lock
undefined
child_process.js:641
throw err;