Required Field not working

cpwebsite,

I found the solution!

file: contact-form-7-city-field-extension.php
line: 163

Problem is in validation.
Correct is:

function wpcf7_cityfieldtext_validation_filter( $result, $tag ) {

	$wpcf7_contact_form = WPCF7_ContactForm::get_current();

	$type = $tag['type'];
	$name = $tag['name'];
	$value = isset( $_POST[$name] )
		? trim( wp_unslash( strtr( (string) $_POST[$name], "\n", " " ) ) )
		: '';

	if ( 'cityfieldtext*' == $type ) {
		if ( '' == $value ) {
			$result->invalidate( $tag, wpcf7_get_message( 'invalid_required' ) );
		}
	}

	return $result;
}