amp-img height problem solved

With some plugins, images are the height attribute empty, and this is an amp error.

This is the error message:

The attribute ‘height’ in tag ‘amp-img’ is set to the invalid value ”.

For solve this, I did the next modification in includes/sanitizers/class-amp-img-sanitizer.php before $new_attributes = $this->enforce_sizes_attribute( $new_attributes );

if ( $new_attributes['height'] === '' ) {
    $new_attributes['height'] = self::FALLBACK_HEIGHT;
}