Error with PHP 7.2

Hi
This is a great plugin which I’ve used for many years. Howwever I’ve just upgraded the server to nginx and PHP7.2, and the plugin shows the following error:
2019/08/21 04:23:00 [error] 6#6: *2509 FastCGI sent in stderr: “PHP message: PHP Fatal error: Uncaught Error: Call to undefined function gregoriantojd() in /var/www/htdocs/wp-content/plugins/wordpress-hebrew-date/heb_date.php:17
Stack trace:
#0 /var/www/htdocs/wp-content/plugins/wordpress-hebrew-date/heb_date.php(48): hebDate(’12:00:41 2019-8…’)
#1 /var/www/htdocs/wp-includes/class-wp-hook.php(288): the_hebDate(’20 Aug 2019′)
#2 /var/www/htdocs/wp-includes/plugin.php(208): WP_Hook->apply_filters(’20 Aug 2019′, Array)
#3 /var/www/htdocs/wp-includes/general-template.php(2403): apply_filters(‘get_the_date’, ’20 Aug 2019′, ‘j M Y’, Object(WP_Post))
#4 /var/www/htdocs/wp-content/themes/Divi/includes/builder/module/Blog.php(1339): get_the_date(‘j M Y’)
#5 /var/www/htdocs/wp-content/themes/Divi/includes/builder/class-et-builder-element.php(2117): ET_Builder_Module_Blog->render(Array, ”, ‘et_pb_blog’, ”, ”, ”, ”)
#6 /var/www/htdocs/wp-includes/shortcodes.php(325): ET_Builder_Element->_render(Array, ”, ‘et_pb_blog’)
#7 [internal function]: do_shortcode_tag(Array)
#8 /” while reading response header from upstream, client: 198.41.238.26, server: bethshalom.org.nz, request: “GET / HTTP/1.1”, upstream: “fastcgi://172.29.0.4:9000”, host: “bethshalom.org.nz”, referrer: “https://bethshalom.org.nz/wp-admin/plugins.php?plugin_status=all&paged=1&s”

Help please!