Domain Maping v4.3.0.4 Generating PHP Debug Errors

Hello,

Our host support department at Page.ly notified us that Domain Mapping is throwing the following errors that need resolving.

PHP Notice: Undefined index: HTTP_HOST in /data/s2400/dom9171/dom9171/wp-content/plugins/domain-mapping/inc/sunrise.php on line 12
Notice: Undefined index: HTTP_HOST in /data/s2400/dom9171/dom9171/wp-content/plugins/domain-mapping/inc/sunrise.php on line 12

Any assistance would be appreciated.

Thanks