Customizer not working – PHP Error

When seeking help with this issue, you may be asked for some of the following information:
WordPress version 6.1.1
Active theme: ProlificPro (version 3.0.3)
Current plugin: (version )
PHP version 8.0.26

Error Details
=============
An error of type E_ERROR was caused in line 127 of the file /homepages/6/d69889053/htdocs/dsa/wp-content/themes/prolificpro/acmethemes/sidebar-widget/acme-gallery-filter.php. Error message: Uncaught TypeError: in_array(): Argument #2 ($haystack) must be of type array, string given in /homepages/6/d69889053/htdocs/dsa/wp-content/themes/prolificpro/acmethemes/sidebar-widget/acme-gallery-filter.php:127
Stack trace:
#0 /homepages/6/d69889053/htdocs/dsa/wp-content/themes/prolificpro/acmethemes/sidebar-widget/acme-gallery-filter.php(127): in_array(1, ”)
#1 /homepages/6/d69889053/htdocs/dsa/wp-includes/class-wp-widget.php(535): Prolific_gallery_filter->form(Array)
#2 /homepages/6/d69889053/htdocs/dsa/wp-admin/includes/widgets.php(274): WP_Widget->form_callback(Array)
#3 /homepages/6/d69889053/htdocs/dsa/wp-includes/class-wp-customize-widgets.php(1128): wp_widget_control(Array, Array)
#4 /homepages/6/d69889053/htdocs/dsa/wp-includes/class-wp-customize-widgets.php(1076): WP_Customize_Widgets->get_widget_control(Array)
#5 /homepages/6/d69889053/htdocs/dsa/wp-includes/class-wp-customize-widgets.php(714): WP_Customize_Widgets->get_available_widgets()
#6 /homepages/6/d69889053/htdocs/dsa/wp-includes/class-wp-hook.php(308): WP_Customize_Widgets->enqueue_scripts(”)
#7 /homepages/6/d69889053/htdocs/dsa/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters(NULL, Array)
#8 /homepages/6/d69889053/htdocs/dsa/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#9 /homepages/6/d69889053/htdocs/dsa/wp-admin/customize.php(123): do_action(‘customize_contr…’)
#10 {main}
thrown