debug.log msg

Resolved

(@jsm06278)

Since Nov 28 the following message has been appearing in our debug.log file at regular intervals (3-4 minutes).

[28-Nov-2022 20:38:26 UTC] PHP Warning:  Cannot modify header information - headers already sent in /XXX/YYYYY/public_html/wp-content/plugins/mailpoet/lib/Util/Cookies.php on line 35
[28-Nov-2022 20:40:26 UTC] PHP Warning:  Cannot modify header information - headers already sent in /XXX/YYYYY/public_html/wp-content/plugins/mailpoet/lib/Util/Cookies.php on line 35
[28-Nov-2022 20:41:30 UTC] PHP Warning:  Cannot modify header information - headers already sent in /XXX/YYYYY/public_html/wp-content/plugins/mailpoet/lib/Util/Cookies.php on line 35
[28-Nov-2022 20:44:26 UTC] PHP Warning:  Cannot modify header information - headers already sent in /XXX/YYYYY/public_html/wp-content/plugins/mailpoet/lib/Util/Cookies.php on line 35
[28-Nov-2022 20:45:29 UTC] PHP Warning:  Cannot modify header information - headers already sent in /XXX/YYYYY/public_html/wp-content/plugins/mailpoet/lib/Util/Cookies.php on line 35
[28-Nov-2022 20:47:28 UTC] PHP Warning:  Cannot modify header information - headers already sent in /XXX/YYYYY/public_html/wp-content/plugins/mailpoet/lib/Util/Cookies.php on line 35
[28-Nov-2022 20:48:30 UTC] PHP Warning:  Cannot modify header information - headers already sent in /XXX/YYYYY/public_html/wp-content/plugins/mailpoet/lib/Util/Cookies.php on line 35
[28-Nov-2022 20:51:27 UTC] PHP Warning:  Cannot modify header information - headers already sent in /XXX/YYYYY/public_html/wp-content/plugins/mailpoet/lib/Util/Cookies.php on line 35
[28-Nov-2022 20:52:26 UTC] PHP Warning:  Cannot modify header information - headers already sent in /XXX/YYYYY/public_html/wp-content/plugins/mailpoet/lib/Util/Cookies.php on line 35
[28-Nov-2022 20:54:26 UTC] PHP Warning:  Cannot modify header information - headers already sent in /XXX/YYYYY/public_html/wp-content/plugins/mailpoet/lib/Util/Cookies.php on line 35
[28-Nov-2022 20:55:31 UTC] PHP Warning:  Cannot modify header information - headers already sent in /XXX/YYYYY/public_html/wp-content/plugins/mailpoet/lib/Util/Cookies.php on line 35
[28-Nov-2022 20:58:26 UTC] PHP Warning:  Cannot modify header information - headers already sent in /XXX/YYYYY/public_html/wp-content/plugins/mailpoet/lib/Util/Cookies.php on line 35
[28-Nov-2022 20:59:27 UTC] PHP Warning:  Cannot modify header information - headers already sent in /XXX/YYYYY/public_html/wp-content/plugins/mailpoet/lib/Util/Cookies.php on line 35
[28-Nov-2022 21:01:32 UTC] PHP Warning:  Cannot modify header information - headers already sent in /XXX/YYYYY/public_html/wp-content/plugins/mailpoet/lib/Util/Cookies.php on line 35
[28-Nov-2022 21:02:26 UTC] PHP Warning:  Cannot modify header information - headers already sent in /XXX/YYYYY/public_html/wp-content/plugins/mailpoet/lib/Util/Cookies.php on line 35
[28-Nov-2022 21:05:27 UTC] PHP Warning:  Cannot modify header information - headers already sent in /XXX/YYYYY/public_html/wp-content/plugins/mailpoet/lib/Util/Cookies.php on line 35
[28-Nov-2022 21:06:27 UTC] PHP Warning:  Cannot modify header information - headers already sent in /XXX/YYYYY/public_html/wp-content/plugins/mailpoet/lib/Util/Cookies.php on line 35
[28-Nov-2022 21:08:26 UTC] PHP Warning:  Cannot modify header information - headers already sent in /XXX/YYYYY/public_html/wp-content/plugins/mailpoet/lib/Util/Cookies.php on line 35

I’m not sure if it actually affects MailPoet operation but it might. Any thoughts on how to resolve this?

Thank you!

Viewing 2 replies - 1 through 2 (of 2 total)

Plugin Support Ojoma a11n
(@geraltrivia)

3 years, 2 months ago

Hello there @jsm06278 ,

Thank you for reaching out to us.

The PHP Warning: Cannot modify header information – headers already error is strange as it is most often caused by issues with faulty code in a plugin file (i.e. whitespace where it shouldn’t be). I’m not seeing other reports of this from other MailPoet users though, which would indicate it is specific to something on your site.

As a first step, reinstalling a fresh copy of the plugin should help ensure there are no files that got corrupted when updating. I’d recommend taking a full backup of the site first, just in case. After that you can download a copy of the plugin here:
https://wordpress.org/plugins/mailpoet/

Then we have a guide for re-installing via FTP here:
https://kb.mailpoet.com/article/258-re-installing-updating-the-plugin-via-ftp

If you are still seeing the same issue after reinstalling, then another good step to try would be a conflict test. Testing to see if the issue occurs with only MailPoet active, and a default theme like Twenty Twenty would help to rule out any conflicts. We have a guide for conflict testing available here:
https://kb.mailpoet.com/article/204-how-to-test-for-plugins-conflict

Please let me know how that goes, or if you have any questions!

Have a great day.

Plugin Support slash1andy
(@slash1andy)

Automattic Happiness Engineer

3 years, 2 months ago

We haven’t heard back from you in a while, so I’m going to mark this as resolved – we’ll be here if and/or when you are ready to continue.

Viewing 2 replies - 1 through 2 (of 2 total)

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