HTTP ERROR 500 due to Latest Plugin Update

[CSFLA]

For the second time in a row, your plugin update has brought down my website. I’ve just uploaded to your latest version and now my site is down again. Here’s the error log…

[Thu Oct 11 21:05:10 2018] [error] [client 80.82.116.220] PHP Fatal error: Call to undefined function wp_doing_ajax() in /var/www/xxx/plugins/simple-membership/classes/class.swpm-wp-loaded-tasks.php on line 76, referer: https://www.csfleak.info/wp-cron.php?doing_wp_cron=1539288309.6381139755249023437500
[Thu Oct 11 21:05:21 2018] [error] [client 94.10.160.232] PHP Fatal error: Call to undefined function wp_doing_ajax() in /var/www/xxx/plugins/simple-membership/classes/class.swpm-wp-loaded-tasks.php on line 76

I’ve now had to roll back to your version 3.6.6, which is the only version that seems to work for me. What’s the score? Thanks.

[mbrsolution]

Hi, what WordPress version do you have running in your site? What PHP version is your server running?

Thank you

[CSFLA]

Hi. We’re running WordPress 4.6.12 and PHP Version 5.4.45. We are unable to update beyond that due to the theme used and some of the custom plugins. It has not been an issue until now and the plugin website doesn’t say these are incompatible.

[mbrsolution]

Hi,

We’re running WordPress 4.6.12 and PHP Version 5.4.45.

This is the reason why you can’t update to the latest version of the plugin. Your PHP and WordPress versions are too old. This represents a security risk.

We are unable to update beyond that due to the theme used and some of the custom plugins. It has not been an issue until now and the plugin website doesn’t say these are incompatible.

I would suggest that you update your theme or change it. I would also hire a developer to update your custom plugins. If you can’t hire someone, you might like to consider using an alternative plugin. In my humble opinion you should always stay up to date for stability, security and performance.

Let me know if you need more information or help.

Kind regards

[The Assurer]

@CSFLA — Please consider updating to the latest version of WordPress, as ALL version of WordPress, earlier than 4.9.7 are affected by a file deletion issue.

Also, please note, the MINIMUM recommended PHP version is now 7.2, as per WordPress.
https://wordpress.org/about/requirements/

[Author]

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