From fe74db631139f4b387f14ae04b967a4658c0edcb Mon Sep 17 00:00:00 2001
From: Philipp Holzer <admin@philipp.info>
Date: Sun, 24 Feb 2019 15:15:25 +0100
Subject: [PATCH 1/2] Fixing
 https://github.com/friendica/friendica/issues/6338#issuecomment-458030934

---
 mod/display.php | 29 ++++++++++++++++-------------
 1 file changed, 16 insertions(+), 13 deletions(-)

diff --git a/mod/display.php b/mod/display.php
index 2e931e068..6723a77e9 100644
--- a/mod/display.php
+++ b/mod/display.php
@@ -19,10 +19,10 @@ use Friendica\Model\Contact;
 use Friendica\Model\Group;
 use Friendica\Model\Item;
 use Friendica\Model\Profile;
+use Friendica\Module\Objects;
 use Friendica\Protocol\ActivityPub;
 use Friendica\Protocol\DFRN;
 use Friendica\Util\Strings;
-use Friendica\Module\Objects;
 
 function display_init(App $a)
 {
@@ -283,22 +283,25 @@ function display_content(App $a, $update = false, $update_uid = 0)
 	$is_remote_contact = false;
 	$item_uid = local_user();
 
-	$parent = Item::selectFirst(['uid'], ['uri' => $item_parent_uri, 'wall' => true]);
-	if (DBA::isResult($parent)) {
-		$a->profile['uid'] = defaults($a->profile, 'uid', $parent['uid']);
-		$a->profile['profile_uid'] = defaults($a->profile, 'profile_uid', $parent['uid']);
-		$is_remote_contact = Contact::isFollower(remote_user(), $a->profile['profile_uid']);
-	}
+	if (isset($item_parent_uri)) {
+		$parent = Item::selectFirst(['uid'], ['uri' => $item_parent_uri, 'wall' => true]);
+		if (DBA::isResult($parent)) {
+			$a->profile['uid'] = defaults($a->profile, 'uid', $parent['uid']);
+			$a->profile['profile_uid'] = defaults($a->profile, 'profile_uid', $parent['uid']);
+			$is_remote_contact = Contact::isFollower(remote_user(), $a->profile['profile_uid']);
 
-	if ($is_remote_contact) {
-		$cdata = Contact::getPublicAndUserContacID(remote_user(), $a->profile['profile_uid']);
-		if (!empty($cdata['user'])) {
-			$groups = Group::getIdsByContactId($cdata['user']);
-			$remote_cid = $cdata['user'];
-			$item_uid = $parent['uid'];
+			if ($is_remote_contact) {
+				$cdata = Contact::getPublicAndUserContacID(remote_user(), $a->profile['profile_uid']);
+				if (!empty($cdata['user'])) {
+					$groups = Group::getIdsByContactId($cdata['user']);
+					$remote_cid = $cdata['user'];
+					$item_uid = $parent['uid'];
+				}
+			}
 		}
 	}
 
+
 	$page_contact = DBA::selectFirst('contact', [], ['self' => true, 'uid' => $a->profile['uid']]);
 	if (DBA::isResult($page_contact)) {
 		$a->page_contact = $page_contact;

From 5b932867c3f62153f590c15f18cc87aae5e69fd7 Mon Sep 17 00:00:00 2001
From: Philipp Holzer <admin@philipp.info>
Date: Sun, 24 Feb 2019 15:22:14 +0100
Subject: [PATCH 2/2] Fixing
 https://github.com/friendica/friendica/issues/6338#issuecomment-466749280

---
 src/Protocol/PortableContact.php | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/Protocol/PortableContact.php b/src/Protocol/PortableContact.php
index 7900ff540..b9c1533e6 100644
--- a/src/Protocol/PortableContact.php
+++ b/src/Protocol/PortableContact.php
@@ -505,8 +505,15 @@ class PortableContact
 		$last_updated = "";
 
 		foreach ($entries as $entry) {
-			$published = DateTimeFormat::utc($xpath->query('atom:published/text()', $entry)->item(0)->nodeValue);
-			$updated   = DateTimeFormat::utc($xpath->query('atom:updated/text()'  , $entry)->item(0)->nodeValue);
+			$published_item = $xpath->query('atom:published/text()', $entry)->item(0);
+			$updated_item   = $xpath->query('atom:updated/text()'  , $entry)->item(0);
+			$published      = isset($published_item->nodeValue) ? DateTimeFormat::utc($published_item->nodeValue) : null;
+			$updated        = isset($updated_item->nodeValue) ? DateTimeFormat::utc($updated_item->nodeValue) : null;
+
+			if (!isset($published) || !isset($updated)) {
+				Logger::notice('Invalid entry for XPath.', ['entry' => $entry, 'profile' => $profile]);
+				continue;
+			}
 
 			if ($last_updated < $published) {
 				$last_updated = $published;