Exception Can't convert custom provisioning address '' into a valid URL. This must be in the format of protocol://host:port - Please re-enter

Exception thrown with message "Can't convert custom provisioning address '' into a valid URL. This must be in the format of protocol://host:port - Please re-enter"

Stacktrace:
#5 Exception in /var/www/html/admin/modules/endpoint/functions.inc/functions_common.php:2960
#4 endpoint_configVariables in /var/www/html/admin/modules/endpoint/functions.inc/functions_common.php:51
#3 endpoint_write_ext in /var/www/html/admin/modules/endpoint/functions.inc/functions_common.php:341
#2 endpoint_save_extensionHook in /var/www/html/admin/modules/endpoint/functions.inc.php:467
#1 endpoint_core_process in /var/www/html/admin/libraries/components.class.php:469
#0 component:processconfigpage in /var/www/html/admin/config.php:450