This is occurring on php 7.4 as well (using plugin version 2.5.4).
It seems that the global $bodhi_svgs_options variable is null within svg-support/functions/mime-types.php (function bodhi_svgs_upload_mimes).
A potential fix would be to reload the plugin options instead of using the global variable using $bodhi_svgs_options = get_option('bodhi_svgs_settings');
