diff --git a/src/Module/Inbox.php b/src/Module/Inbox.php
index 891211186a..4fc450d85a 100644
--- a/src/Module/Inbox.php
+++ b/src/Module/Inbox.php
@@ -25,6 +25,8 @@ class Inbox extends BaseModule
 			System::httpExit(400);
 		}
 
+// Enable for test purposes
+/*
 		if (HTTPSignature::getSigner($postdata, $_SERVER)) {
 			$filename = 'signed-activitypub';
 		} else {
@@ -35,7 +37,7 @@ class Inbox extends BaseModule
 		file_put_contents($tempfile, json_encode(['argv' => $a->argv, 'header' => $_SERVER, 'body' => $postdata], JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE));
 
 		logger('Incoming message stored under ' . $tempfile);
-
+*/
 		if (!empty($a->argv[1])) {
 			$user = DBA::selectFirst('user', ['uid'], ['nickname' => $a->argv[1]]);
 			if (!DBA::isResult($user)) {
diff --git a/src/Protocol/ActivityPub.php b/src/Protocol/ActivityPub.php
index 4697e3f8fc..62d6dac0f8 100644
--- a/src/Protocol/ActivityPub.php
+++ b/src/Protocol/ActivityPub.php
@@ -363,7 +363,7 @@ class ActivityPub
 			}
 		}
 
-		$parents = Item::select(['author-link', 'owner-link', 'gravity'], ['parent' => $item['parent']]);
+		$parents = Item::select(['id', 'author-link', 'owner-link', 'gravity'], ['parent' => $item['parent']]);
 		while ($parent = Item::fetch($parents)) {
 			// Don't include data from future posts
 			if ($parent['id'] >= $item['id']) {
@@ -1535,6 +1535,11 @@ class ActivityPub
 	private static function postItem($activity, $item, $body)
 	{
 		/// @todo What to do with $activity['context']?
+		if (empty($activity['author']))
+			logger('Empty author');
+
+		if (empty($activity['owner']))
+			logger('Empty owner');
 
 		$item['network'] = Protocol::ACTIVITYPUB;
 		$item['private'] = !in_array(0, $activity['receiver']);