Redux Form - How to delete an item of the state in Redux Form

Question

I use Redux-form change function to change the state of the form. if this attribute exists, it will append the value directly to the state, if it doesn't exist, it will add this attribute with the value to the state. Is that possible to delete this key-value pair in the state?

if (language === 'English') {
  change('languages', 'English');
} else if (typeof language === 'Unknown') {
 *** delete languages: English from the state ***
}

var language = 'English'
expected result: { languages: English }

var language = 'Unknow'
expected result: {}