count(): Parameter must be an array or an object that implements

Hi someone please can help me?

I've updated the PHP to 7.4 and I got this error message:
count(): Parameter must be an array or an object that implements Countable in ………………… on line 216

The function is: 

// Return custom sidebars list, prepended inherit and main sidebars item (if need)
if ( !function_exists( 'custom_made_get_list_sidebars' ) ) {
	function custom_made_get_list_sidebars($prepend_inherit=false) {
		if (($list = custom_made_storage_get('list_sidebars'))=='') {
			$list = apply_filters('custom_made_filter_list_sidebars', array(
				'sidebar_widgets'		=> esc_html__('Sidebar Widgets', 'custom-made'),
				'header_widgets'		=> esc_html__('Header Widgets', 'custom-made'),
				'above_page_widgets'	=> esc_html__('Above Page Widgets', 'custom-made'),
				'above_content_widgets' => esc_html__('Above Content Widgets', 'custom-made'),
				'below_content_widgets' => esc_html__('Below Content Widgets', 'custom-made'),
				'below_page_widgets' 	=> esc_html__('Below Page Widgets', 'custom-made'),
				'footer_widgets'		=> esc_html__('Footer Widgets', 'custom-made')
				)
			);
			$custom_sidebars_number = max(0, min(2, custom_made_get_theme_setting('custom_sidebars')));
<strong>			if (count($custom_sidebars_number) > 0) {</strong>
				for ($i=1; $i <= $custom_sidebars_number; $i++) {
					$list['custom_widgets_'.intval($i)] = sprintf(esc_html__('Custom Widgets %d', 'custom-made'), $i);
				}
			}
			custom_made_storage_set('list_sidebars', $list);
		}
		return $prepend_inherit ? custom_made_array_merge(array('inherit' => esc_html__("Inherit", 'custom-made')), $list) : $list;
	}
}

The bold is the line 216.