[Forminator] Conflicting with ThemeREX Addons plugin

A plugin named “ThemeRex Addons” required by the theme we’re using is conflicting with the Forminator Plugin.

When both of them are activated together, I can see the following error in the WordPress Dashboard:

Undefined setting "allow_upload_svg" called from:
Array[4]

file => "/Users/++++/Sites/Mamp/+++++-single.local/wp-content/plugins/trx_addons/includes/plugin.media.php"

line => 30

function => "trx_addons_get_setting"

args => Array[1]

0 => "allow_upload_svg"

Weirdly, this only started happening after I migrated the site. It did not happen before. Please advice.