Fatal error on PHP 8.1

Hello,

After an upgrading to PHP 8.1 my site crashes.
For details please see the stack trace below.
Can you help?

Thanks in advance!

<b>Fatal error</b>:  Uncaught TypeError: Unsupported operand types: string / float in /path/to/wordpress/wp-content/plugins/ml-slider/inc/metaslider.imagehelper.class.php:204
Stack trace:
#0 /path/to/wordpress/wp-content/plugins/ml-slider/inc/metaslider.imagehelper.class.php(254): MetaSliderImageHelper->get_crop_dimensions(768, 1024)
#1 /path/to/wordpress/wp-content/plugins/ml-slider/inc/slide/metaslide.image.class.php(489): MetaSliderImageHelper->get_image_url()
#2 /path/to/wordpress/wp-content/plugins/ml-slider/inc/slide/metaslide.class.php(190): MetaImageSlide->get_public_slide()
#3 /path/to/wordpress/wp-content/plugins/ml-slider/inc/slide/metaslide.class.php(60): MetaSlide->get_slide_html()
#4 /path/to/wordpress/wp-includes/class-wp-hook.php(309): MetaSlide->get_slide(5908, '5902')
#5 /path/to/wordpress/wp-includes/plugin.php(189): WP_Hook->apply_filters(5908, Array)
#6 /path/to/wordpress/wp-content/plugins/ml-slider/inc/slider/metaslider.class.php(208): apply_filters('metaslider_get_...', 5908, '5902', 5908)
#7 /path/to/wordpress/wp-content/plugins/ml-slider/inc/slider/metaslider.class.php(31): MetaSlider->populate_slides()
#8 /path/to/wordpress/wp-content/plugins/ml-slider/inc/slider/metaslider.flex.class.php(29): MetaSlider->__construct('5902', Array)
#9 /path/to/wordpress/wp-content/plugins/ml-slider/ml-slider.php(659): MetaFlexSlider->__construct('5902', Array)
#10 /path/to/wordpress/wp-content/plugins/ml-slider/ml-slider.php(641): MetaSliderPlugin->load_slider('flex', '5902', Array)
#11 /path/to/wordpress/wp-content/plugins/ml-slider/ml-slider.php(504): MetaSliderPlugin->set_slider('5902', Array)
#12 /path/to/wordpress/wp-includes/shortcodes.php(356): MetaSliderPlugin->register_shortcode(Array, '', 'metaslider')
#13 [internal function]: do_shortcode_tag(Array)
#14 /path/to/wordpress/wp-includes/shortcodes.php(228): preg_replace_callback('/\\[(\\[?)(metasl...', 'do_shortcode_ta...', '<h2>Aktuelles</...')
#15 /path/to/wordpress/wp-includes/class-wp-hook.php(307): do_shortcode('<h2>Aktuelles</...')
#16 /path/to/wordpress/wp-includes/plugin.php(189): WP_Hook->apply_filters('<h2>Aktuelles</...', Array)
#17 /path/to/wordpress/wp-content/themes/fluida/includes/landing-page.php(295): apply_filters('the_content', '<h2>Aktuelles</...')
#18 /path/to/wordpress/wp-content/themes/fluida/content/landing-page.php(10): fluida_lptext('one')
#19 /path/to/wordpress/wp-includes/template.php(772): require('/var/www/server...')
#20 /path/to/wordpress/wp-includes/template.php(716): load_template('/var/www/server...', false, Array)
#21 /path/to/wordpress/wp-includes/general-template.php(204): locate_template(Array, true, false, Array)
#22 /path/to/wordpress/wp-content/themes/fluida/front-page.php(29): get_template_part('content/landing...')
#23 /path/to/wordpress/wp-includes/template-loader.php(106): include('/var/www/server...')
#24 /path/to/wordpress/wp-blog-header.php(19): require_once('/var/www/server...')
#25 /path/to/wordpress/index.php(17): require('/var/www/server...')
#26 {main}
 thrown in <b>/path/to/wordpress/wp-content/plugins/ml-slider/inc/metaslider.imagehelper.class.php</b> on line <b>204</b>