Lots of debug.logs

One day, when I enabled debugging in WordPress, the following notis was being generated in wp-content/debug.log in large numbers every second.
I can only assume that this is a very overloaded process.
If anyone knows how to stop this, please let me know.

[22-May-2023 12:17:23 UTC] PHP Notice: Array to string conversion in /var/www/html/wp-content/plugins/custom-post-type-permalinks/CPTP/Module/Rewrite.php on line 249
[22-May-2023 12:17:23 UTC] PHP Notice: Array to string conversion in /var/www/html/wp-content/plugins/custom-post-type-permalinks/CPTP/Module/Rewrite.php on line 249
[22-May-2023 12:17:23 UTC] PHP Notice: Array to string conversion in /var/www/html/wp-content/plugins/custom-post-type-permalinks/CPTP/Module/Rewrite.php on line 249
[22-May-2023 12:17:23 UTC] PHP Notice: Array to string conversion in /var/www/html/wp-content/plugins/custom-post-type-permalinks/CPTP/Module/Rewrite.php on line 249
[22-May-2023 12:17:23 UTC] PHP Notice: Array to string conversion in /var/www/html/wp-content/plugins/custom-post-type-permalinks/CPTP/Module/Rewrite.php on line 249
[22-May-2023 12:17:23 UTC] PHP Notice: Array to string conversion in /var/www/html/wp-content/plugins/custom-post-type-permalinks/CPTP/Module/Rewrite.php on line 249
[22-May-2023 12:17:23 UTC] PHP Notice: Array to string conversion in /var/www/html/wp-content/plugins/custom-post-type-permalinks/CPTP/Module/Rewrite.php on line 249
[22-May-2023 12:17:23 UTC] PHP Notice: Array to string conversion in /var/www/html/wp-content/plugins/custom-post-type-permalinks/CPTP/Module/Rewrite.php on line 249
[22-May-2023 12:17:23 UTC] PHP Notice: Array to string conversion in /var/www/html/wp-content/plugins/custom-post-type-permalinks/CPTP/Module/Rewrite.php on line 249
[22-May-2023 12:17:23 UTC] PHP Notice: Array to string conversion in /var/www/html/wp-content/plugins/custom-post-type-permalinks/CPTP/Module/Rewrite.php on line 249