is_page was called incorrectly

Hi

when i turn on the debug log, i see following php notices non-stop being generated by this plugin.

PHP Notice: is_singular was called incorrectly
PHP Notice: is_page was called incorrectly.

I saw someone reported the issue a year ago.
https://wordpress.org/support/topic/plugin-throws-notice-is_page-was-called-incorrectly/

but I still do see the error keeps coming in.

Do you have any fix for that? how to stop this?
Please advise.

Thank you