PHP warning

Hello,

I’m noticing the following entries in PHP error log under PHP 7.2.x

[04-Apr-2019 12:17:29 UTC] PHP Warning:  implode(): Invalid arguments passed in .../wp-content/plugins/post-views-counter/includes/crawler-detect.php on line 153
[04-Apr-2019 12:17:29 UTC] PHP Stack trace:
[04-Apr-2019 12:17:29 UTC] PHP   1. {main}() .../wp-content/plugins/post-views-counter/includes/ajax.php:0
[04-Apr-2019 12:17:29 UTC] PHP   2. do_action() .../wp-content/plugins/post-views-counter/includes/ajax.php:87
[04-Apr-2019 12:17:29 UTC] PHP   3. WP_Hook->do_action() .../wp-includes/plugin.php:465
[04-Apr-2019 12:17:29 UTC] PHP   4. WP_Hook->apply_filters() .../wp-includes/class-wp-hook.php:310
[04-Apr-2019 12:17:29 UTC] PHP   5. Post_Views_Counter_Counter->check_post_ajax() .../wp-includes/class-wp-hook.php:286
[04-Apr-2019 12:17:29 UTC] PHP   6. Post_Views_Counter_Counter->check_post() .../wp-content/plugins/post-views-counter/includes/counter.php:190
[04-Apr-2019 12:17:29 UTC] PHP   7. Post_Views_Counter_Crawler_Detect->is_crawler() .../wp-content/plugins/post-views-counter/includes/counter.php:88
[04-Apr-2019 12:17:29 UTC] PHP   8. Post_Views_Counter_Crawler_Detect->get_exclusions() .../wp-content/plugins/post-views-counter/includes/crawler-detect.php:165
[04-Apr-2019 12:17:29 UTC] PHP   9. implode() .../wp-content/plugins/post-views-counter/includes/crawler-detect.php:153

Looks like a bug?