Bulk update price does not work.

Hi, I have this error when i try to bulk update B2B price for product variants (bulk actions).

PHP Fatal error:  Uncaught TypeError: Cannot access offset of type string on string in /..wp-content/plugins/wholesalex/includes/class-wholesalex-product.php:2759
Stack trace:
#0 .../wp-includes/class-wp-hook.php(324): WHOLESALEX\WHOLESALEX_Product->handle_wholesalex_bulk_edit_variations('')
#1 ../wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters('', Array)
#2 ../wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#3 /../wp-admin/admin-ajax.php(192): do_action('wp_ajax_wholesa...')
#4 ./.composer/vendor/laravel/valet/server.php(110): require('/....')
#5 {main}
  thrown in ../wp-content/plugins/wholesalex/includes/class-wholesalex-product.php on line 2759

So the bulk update does not work.