diff --git a/include/notifier.php b/include/notifier.php
index 5cbd3deb19..14057c35b3 100644
--- a/include/notifier.php
+++ b/include/notifier.php
@@ -505,6 +505,9 @@ function notifier_run($argv, $argc){
 					require_once('include/diaspora.php');
 					if(get_config('system','dfrn_only') || (! get_config('system','diaspora_enabled')) || (! $normal_mode))
 						break;
+
+					if(! contact['pubkey'])
+						break;
 					
 					if($target_item['verb'] === ACTIVITY_DISLIKE) {
 						// unsupported
@@ -625,6 +628,9 @@ function notifier_run($argv, $argc){
 							require_once('include/diaspora.php');
 							if(get_config('system','dfrn_only') || (! get_config('system','diaspora_enabled')) || (! $normal_mode))
 								break;
+
+							if(! contact['pubkey'])
+								break;
 					
 							if($target_item['verb'] === ACTIVITY_DISLIKE) {
 								// unsupported