Version 5.0.0 beta 6

applications/core/modules/admin/promotion/advertisements.php

@@ -769,7 +769,7 @@ class advertisements extends Controller
 
 			/* Any additional settings to save? */
 			$additionalSettings	= array(
-				'ad_apps' => ( isset( $values['ad_apps'] ) AND $values['ad_apps'] != 0 ) ? array_keys( $values['ad_apps'] ) : 0
+				'ad_apps' => ( isset( $values['ad_apps'] ) AND is_array( $values['ad_apps'] ) ) ? array_keys( $values['ad_apps'] ) : 0
 			);
 
 			if( $values['ad_type'] == Advertisement::AD_EMAIL )