Version 4.7.6

applications/core/modules/front/promote/promote.php

@@ -530,7 +530,7 @@ class _promote extends \IPS\Dispatcher\Controller
 			$scheduled = time();
 			$scheduleAuto = 0;
 			
-			if ( $values['promote_schedule'] == 'custom' )
+			if ( $values['promote_schedule'] == 'custom' AND $values['promote_custom_date'] )
 			{
 				$scheduled = $values['promote_custom_date']->getTimestamp();
 			}