Oh, I found this:
On single-site, you can edit this via the Varnish > Check Caching page. On Multisite, you’ll need to add the following to your wp-config.php file: define('VHP_VARNISH_IP','123.45.67.89');
Should I add my internal IP to varnish like this?
I’m also getting an 500 error, but only on the startpage. I tried deactivating all plugins and enabled them one by one. I located the error to this plugin. Do you have an idea of when it will be fixed.
The website affected is http://www.bringwell.com/
Many thanks!
Notice that after you fix the blank charachters. The redirect will not work with page ID.
You need to explicity write e.g:
p=42 (will work)
42 (will not work)
Solved this issue with:
if (class_exists('Mfma_rlMediaSelector')) {
//Code block
}
Make sure you refresh your page afterwards…
See also: If class exists thread…
🙂