Default value of levelColumnName option will be changed from level to false in the next major release.
If you didn't use levelColumnName option, or it had falsable value, then you need to add this option: levelColumnName: 'level'.
const Tag = ns(sequelize, DataTypes, 'Tag', {
// your object attributes (table columns)
}, {
levelColumnName: 'level',
// other your options
});