woocommerce virtual review

I am trying a woocommerce virtual review… seems like its not working properly..

When I tried to add automatic virtual review… from your plugin setting, after I save, generate review, then I start, it is only working for 1 or 2 items…then its freeze/not moving at all..

When I tried to add from the product side, it gives me fatal error error code is below:

Error Details
=============
An error of type E_ERROR was caused in line 177 of the file /home/agh4gcpan/public_html/wp-content/plugins/woo-virtual-reviews/includes/add-multi-reviews.php. Error message: Uncaught Error: Cannot use assign-op operators with string offsets in /home/agh4gcpan/public_html/wp-content/plugins/woo-virtual-reviews/includes/add-multi-reviews.php:177
Stack trace:
#0 /home/agh4gcpan/public_html/wp-content/plugins/woo-virtual-reviews/includes/add-multi-reviews.php(109): WooVRAdd_Multi_Reviews->add_multi_reviews(Array, ‘3’)
#1 /home/agh4gcpan/public_html/wp-includes/class-wp-hook.php(288): WooVRAdd_Multi_Reviews->add_reviews_by_submit(”)
#2 /home/agh4gcpan/public_html/wp-includes/class-wp-hook.php(312): WP_Hook->apply_filters(”, Array)
#3 /home/agh4gcpan/public_html/wp-includes/plugin.php(478): WP_Hook->do_action(Array)
#4 /home/agh4gcpan/public_html/wp-admin/admin.php(401): do_action(‘admin_action_ad…’)
#5 /home/agh4gcpan/public_html/wp-admin/edit.php(10): require_once(‘/home/agh4gcpan…’)
#6 {main}
thrown

can you help me fix this issue?