diff --git a/plugins/ActivityPub/Util/Model/ActivityCreate.php b/plugins/ActivityPub/Util/Model/ActivityCreate.php
index abc934b410..84b72475a5 100644
--- a/plugins/ActivityPub/Util/Model/ActivityCreate.php
+++ b/plugins/ActivityPub/Util/Model/ActivityCreate.php
@@ -55,12 +55,12 @@ class ActivityCreate extends Activity
             if ($type_object->get('type') === 'Note'  || $type_object->get('type') === 'Page') {
                 $actual_to = array_flip(is_string($type_object->get('to')) ? [$type_object->get('to')] : $type_object->get('to'));
                 $actual_cc = array_flip(is_string($type_object->get('cc')) ? [$type_object->get('cc')] : $type_object->get('cc'));
-                foreach (is_string($type_activity->get('to')) ? [$type_activity->get('to')] : $type_activity->get('to') as $to) {
+                foreach (is_string($type_activity->get('to')) ? [$type_activity->get('to')] : ($type_activity->get('to') ?? []) as $to) {
                     if ($to !== 'https://www.w3.org/ns/activitystreams#Public') {
                         $actual_to[$to] = true;
                     }
                 }
-                foreach (is_string($type_activity->get('cc')) ? [$type_activity->get('cc')] : $type_activity->get('cc') as $cc) {
+                foreach (is_string($type_activity->get('cc')) ? [$type_activity->get('cc')] : ($type_activity->get('cc') ?? []) as $cc) {
                     if ($cc !== 'https://www.w3.org/ns/activitystreams#Public') {
                         $actual_cc[$cc] = true;
                     }
diff --git a/plugins/ActivityPub/Util/Model/Note.php b/plugins/ActivityPub/Util/Model/Note.php
index e8ccbda5d9..6a74fddb2e 100644
--- a/plugins/ActivityPub/Util/Model/Note.php
+++ b/plugins/ActivityPub/Util/Model/Note.php
@@ -224,7 +224,7 @@ class Note extends Model
 
         // Attachments
         $processed_attachments = [];
-        foreach ($type_note->get('attachment') as $attachment) {
+        foreach ($type_note->get('attachment') ?? [] as $attachment) {
             if ($attachment->get('type') === 'Document') {
                 // Retrieve media
                 $get_response = HTTPClient::get($attachment->get('url'));
@@ -253,7 +253,7 @@ class Note extends Model
         // Assign conversation to this note
         Conversation::assignLocalConversation($obj, $reply_to);
 
-        foreach ($type_note->get('tag') as $ap_tag) {
+        foreach ($type_note->get('tag') ?? [] as $ap_tag) {
             switch ($ap_tag->get('type')) {
                 case 'Mention':
                 case 'Group':