Not working after update WP & Plugin

First thanks for this wonderful plugin!

After update to WP 5.2.2 and multiple-domain-mapping-on-single-site 1.0.3 i get a 503 error if i try to reach the “rewrited” Domain.

Error in the error-log are all like this one:
….mod_fcgid: can’t apply process slot for /var/www/php-starter/web27243763/php7.2-fcgi-wrapper, referer: https://www.mydomain.de/wp-content/themes/thetheme/css/bootstrap/bootstrap.min.css?ver=1

at first I thought okay maybe a problem with the new one so i reinstall 1.0.2, but no same problem. if i install the backup of WP 5.1.1 it works. At the moment i have reinstall wp 5.2.2 and deinstall multiple-domain-mapping all works fine.

Any suggestions?