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$slick_slider = $('.slider');
settings = {
  // some settings
}
$slick_slider.slick(settings);

// reslick only if it's not slick()
$(window).on('resize', function() {
  if ($(window).width() < 768) {
    if ($slick_slider.hasClass('slick-initialized')) {
      $slick_slider.slick('unslick');
    }
    return
  }

  if (!$slick_slider.hasClass('slick-initialized')) {
    return $slick_slider.slick(settings);
  }
});