Server 5xx and php errors.

We contacted our host after our site experienced a number of 500, 520 and 521 errors.

Our host suggested we should contact you:

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looking at the logs it seems this may an issue with a plugin.
redactedwebsited.com [Mon Aug 03 02:02:33 2020] [error] [client xxx.158.78.31:0] PHP Warning: A non-numeric value encountered in /home/sites/X10a/5/5211xxx/public_html/wp-content/plugins/wp-last-modified-info/includes/shortcode.php on line 89

Redactedwebsite.com [Mon Aug 03 09:05:02 2020] [error] [client xxx.158.159.49:0] End of script output before headers: wp-cron.php
The path to the file in the error is – public_html/wp-content/plugins/wp-last-modified-info/includes/shortcode.php on line 89
That line is as follows:
”
if ( $mod_time < ( $pub_time + $gap ) ) return;

”

It may be worth taking this to the plugin developers to see if they can shed some light on this for you.

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Thanks for your help with this.