PHP warnings caused by this plugin

I’m getting this in my logs every time the WordPress Admin Dashboard page is loaded:

```
[Sat Jul 09 16:43:19.242858 2022] [proxy_fcgi:error] [pid 263049:tid 140294787864320] [client 180.230.169.198:0] AH01071: Got error 'PHP message: PHP Warning: Undefined array key "tab" in /home/alec/web/mydomain.com/public_html/wp-content/plugins/woocommerce-sendinblue-newsletter-subscription/includes/wc-sendinblue-settings.php on line 972', referer: https://www.mydomain.com/blog/post-name/
```

I assumed this issue was caused by the [WooCommerce – Sendinblue Add-on](https://wordpress.org/plugins/woocommerce-sendinblue-newsletter-subscription/) plugin, as that’s where the error is occurring. I chased this with the Sendinblue development team but they failed to reproduce the issue.

After a long process of elimination by disabling all plugins, I have identified this "Activity Log" plugin as the one causing this warning.

If Activity Log is enabled, I get this error on every load of Dashboard. If Activity Log is disabled (and all my other plugins are enabled) the error does not occur.

This is filling my logs, any chance you could fix this?