Plugin crashes my site

I have been using this plugin on a development site for a few months with no issues. Now, with the upgrade to v1.1.2, it crashes my site and puts it into recovery mode. Error details are as follows:

An error of type E_ERROR was caused in line 445 of the file …/development/wp-content/plugins/themify-portfolio-post/includes/themify-metabox/includes/themify-metabox-core.php. Error message: Uncaught Error: Call to undefined function themify_enque() in …/development/wp-content/plugins/themify-portfolio-post/includes/themify-metabox/includes/themify-metabox-core.php:445
Stack trace:
#0 …/development/wp-includes/class-wp-hook.php(288): Themify_Metabox->admin_enqueue_scripts(‘plugins.php’)
#1 …/development/wp-includes/class-wp-hook.php(312): WP_Hook->apply_filters(NULL, Array)
#2 …/development/wp-includes/plugin.php(478): WP_Hook->do_action(Array)
#3 …/development/wp-admin/admin-header.php(104): do_action(‘admin_enqueue_s…’, ‘plugins.php’)
#4 …/development/wp-admin/plugins.php(481): require_once(‘/home/adelphi/p…’)
#5 {main}
thrown