Hello, the issue is still present, we noticed it because the error_log took almost 40GB of space in our server, here is an extract of the logs:
[19-Oct-2020 15:22:35] WARNING: [pool yncqhzkggn] child 15273 said into stderr: "NOTICE: PHP message: PHP Warning: in_array() expects parameter 2 t o be array, string given in /home/467531.cloudwaysapps.com/yncqhzkggn/public_html/wp-content/plugins/ajax-search-pro/includes/functions/functions.ph p on line 2550"
[19-Oct-2020 15:22:35] WARNING: [pool yncqhzkggn] child 15273 said into stderr: "NOTICE: PHP message: PHP Warning: in_array() expects parameter 2 t o be array, string given in /home/467531.cloudwaysapps.com/yncqhzkggn/public_html/wp-content/plugins/ajax-search-pro/includes/functions/functions.ph p on line 2551"
[19-Oct-2020 15:22:35] WARNING: [pool yncqhzkggn] child 15273 said into stderr: "NOTICE: PHP message: PHP Warning: in_array() expects parameter 2 t o be array, string given in /home/467531.cloudwaysapps.com/yncqhzkggn/public_html/wp-content/plugins/ajax-search-pro/includes/functions/functions.ph p on line 2552"
[19-Oct-2020 15:22:36] WARNING: [pool yncqhzkggn] child 15273 said into stderr: "NOTICE: PHP message: PHP Warning: in_array() expects parameter 2 t o be array, string given in /home/467531.cloudwaysapps.com/yncqhzkggn/public_html/wp-content/plugins/ajax-search-pro/includes/functions/functions.ph p on line 2549"
[19-Oct-2020 15:22:36] WARNING: [pool yncqhzkggn] child 15273 said into stderr: "NOTICE: PHP message: PHP Warning: in_array() expects parameter 2 t o be array, string given in /home/467531.cloudwaysapps.com/yncqhzkggn/public_html/wp-content/plugins/ajax-search-pro/includes/functions/functions.ph p on line 2550"
[19-Oct-2020 15:22:36] WARNING: [pool yncqhzkggn] child 15273 said into stderr: "NOTICE: PHP message: PHP Warning: in_array() expects parameter 2 t o be array, string given in /home/467531.cloudwaysapps.com/yncqhzkggn/public_html/wp-content/plugins/ajax-search-pro/includes/functions/functions.ph p on line 2551"
[19-Oct-2020 15:22:36] WARNING: [pool yncqhzkggn] child 15273 said into stderr: "NOTICE: PHP message: PHP Warning: in_array() expects parameter 2 t o be array, string given in /home/467531.cloudwaysapps.com/yncqhzkggn/public_html/wp-content/plugins/ajax-search-pro/includes/functions/functions.ph p on line 2552"