Title: PHP Warning “Undefined array key “blocks” Last modified: June 17, 2025 --- # PHP Warning “Undefined array key “blocks” * Resolved [asanacori](https://wordpress.org/support/users/asanacori/) * (@asanacori) * [11 months, 2 weeks ago](https://wordpress.org/support/topic/php-warning-undefined-array-key-blocks/) * Hello. * In ../wp-content/plugins/mailpoet/lib/Newsletter/Renderer/Blocks/Renderer.php on line 78 i get the following message: “PHP Warning: Undefined array key “blocks” in …/wp-content/plugins/mailpoet/lib/Newsletter/Renderer/Columns/Renderer.php on line 12′ * Can you explain me what the error means and how to fix it? Thanks. Viewing 10 replies - 1 through 10 (of 10 total) * Plugin Author [paveldohnal](https://wordpress.org/support/users/paveldohnal/) * (@paveldohnal) * [11 months, 2 weeks ago](https://wordpress.org/support/topic/php-warning-undefined-array-key-blocks/#post-18515798) * Hello asanacori, * Thanks for reaching out. * This warning shouldn’t normally appear. There are guardrails in place to prevent this situation, so it’s not clear why it’s happening in your case. * Could you let us know where exactly you see this warning? For example: - Do you see it while performing a specific action in the admin? - Or does it appear in logs only? - Is any part of the email editor or sending functionality not working as expected? * This information will help us investigate further and suggest the right fix. * Thread Starter [asanacori](https://wordpress.org/support/users/asanacori/) * (@asanacori) * [11 months, 2 weeks ago](https://wordpress.org/support/topic/php-warning-undefined-array-key-blocks/#post-18517466) * Hello, * this error appeared in the server log files, during normal usage activities of your plugin no error appears. * Plugin Support [Gui A. a11n](https://wordpress.org/support/users/guicmazeredo/) * (@guicmazeredo) * [11 months, 2 weeks ago](https://wordpress.org/support/topic/php-warning-undefined-array-key-blocks/#post-18518204) * Thanks for getting back to us with more details! * Could you please follow the instructions to [re-install the plugin via FTP](https://kb.mailpoet.com/article/258-re-installing-updating-the-plugin-via-ftp) and let us know if this error will go away? This will ensure no plugin files are missing or corrupted. * Don’t worry, **you won’t lose any data from the plugin** since it’s saved in your database, not the plugin files. However, whenever making any changes like this, we recommend making sure you have a full backup of the site just in case. * Thread Starter [asanacori](https://wordpress.org/support/users/asanacori/) * (@asanacori) * [11 months, 1 week ago](https://wordpress.org/support/topic/php-warning-undefined-array-key-blocks/#post-18530768) * Hello. * I reinstalled the plugin manually but the error continues to be reported only in the logs: AH01071: Got error ‘PHP message: PHP Warning: Undefined array key“ blocks” in /wp-content/plugins/mailpoet/lib/Newsletter/Renderer/Blocks/Renderer. php on line 78PHP message: PHP Warning: Undefined array key “blocks” in /wp-content/ plugins/mailpoet/lib/Newsletter/Renderer/Columns/Renderer.php on line 12′ * Indeed, in the newsletter in composition there are some content blocks that still need to be enhanced. * Plugin Author [Ján Mikláš](https://wordpress.org/support/users/neosinner/) * (@neosinner) * [11 months, 1 week ago](https://wordpress.org/support/topic/php-warning-undefined-array-key-blocks/#post-18530777) * Hi [@asanacori](https://wordpress.org/support/users/asanacori/), have you installed version 5.12.8 which was released two days ago? It should include the fix, so if you still experience the issue, there might be different issue. * Thread Starter [asanacori](https://wordpress.org/support/users/asanacori/) * (@asanacori) * [11 months ago](https://wordpress.org/support/topic/php-warning-undefined-array-key-blocks/#post-18533809) * Hi Jan, I installed version 5.12.8 on my wordpress 5.12.8, now I always get an error message but only on line 12, namely: Got error ‘PHP message: PHP Warning: Undefined array key “blocks” in ../wp-content/plugins/mailpoet/lib/Newsletter/ Renderer/Columns/Renderer.php on line 12’. * Plugin Author [Ján Mikláš](https://wordpress.org/support/users/neosinner/) * (@neosinner) * [11 months ago](https://wordpress.org/support/topic/php-warning-undefined-array-key-blocks/#post-18535720) * Hi [@asanacori](https://wordpress.org/support/users/asanacori/), there was indeed still a way to generate this warning. It’s [fixed in this PR](https://github.com/mailpoet/mailpoet/pull/6242), and it should be included in the release next week (probably in version 5.12.10). * Thread Starter [asanacori](https://wordpress.org/support/users/asanacori/) * (@asanacori) * [11 months ago](https://wordpress.org/support/topic/php-warning-undefined-array-key-blocks/#post-18535922) * Hi [@neosinner](https://wordpress.org/support/users/neosinner/), I’ll wait, thank you. * Plugin Author [Ján Mikláš](https://wordpress.org/support/users/neosinner/) * (@neosinner) * [10 months, 3 weeks ago](https://wordpress.org/support/topic/php-warning-undefined-array-key-blocks/#post-18545938) * Hi [@asanacori](https://wordpress.org/support/users/asanacori/), we just released version 5.12.10 – could you please try it out to see if it helped fix the issue? * Thread Starter [asanacori](https://wordpress.org/support/users/asanacori/) * (@asanacori) * [10 months, 3 weeks ago](https://wordpress.org/support/topic/php-warning-undefined-array-key-blocks/#post-18549380) * Yes, the problem has been resolved, thank you. Viewing 10 replies - 1 through 10 (of 10 total) The topic ‘PHP Warning “Undefined array key “blocks”’ is closed to new replies. * ![](https://ps.w.org/mailpoet/assets/icon-256x256.png?rev=3284564) * [MailPoet - Newsletters, Email Marketing, and Automation](https://wordpress.org/plugins/mailpoet/) * [Frequently Asked Questions](https://wordpress.org/plugins/mailpoet/#faq) * [Support Threads](https://wordpress.org/support/plugin/mailpoet/) * [Active Topics](https://wordpress.org/support/plugin/mailpoet/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/mailpoet/unresolved/) * [Reviews](https://wordpress.org/support/plugin/mailpoet/reviews/) * 10 replies * 4 participants * Last reply from: [asanacori](https://wordpress.org/support/users/asanacori/) * Last activity: [10 months, 3 weeks ago](https://wordpress.org/support/topic/php-warning-undefined-array-key-blocks/#post-18549380) * Status: resolved