Warning from oik-types.php line 542

[bobbingwide]

This message has been logged quite a few times in php_errorlog on bobbingwide.com since the start of the log ( April 2021 ).

PHP Warning: First parameter must either be an object or the name of an existing class in /home/customer/www/bobbingwide.com/public_html/wp-content/plugins/oik-types/oik-types.php on line 542

[bobbingwide]

Also appears in herbmiller.me

[bobbingwide]

Having written a routine called clog.php I noticed this message appearing many times in the
debug log for oik-plugins.com

45 PHP Warning: First parameter must either be an object or the name of an existing class in oik-plugins.com@plugins/oik-types/oik-types.php on line 570
179 PHP Warning: First parameter must either be an object or the name of an existing class in oik-plugins.com@plugins/oik-types/oik-types.php on line 573
840 PHP Warning: First parameter must either be an object or the name of an existing class in oik-plugins.com@plugins/oik-types/oik-types.php on line 572

It would appear that $post_type_object is null... but I don't know why.
Need to find the last message and see if there's a daily trace summary record that matches it.

It happened again today. The request was from a bot.
I reproduced it locally with:

http://s.b/oikcom/letters/s/?post_type%5B0%5D=post