diff --git a/mod/ping.php b/mod/ping.php
index 6efa889c7..64c947e2c 100644
--- a/mod/ping.php
+++ b/mod/ping.php
@@ -139,7 +139,7 @@ function ping_init(App $a)
 			local_user(), Verb::getID(Activity::FOLLOW)];
 		$items = Post::selectForUser(local_user(), ['wall', 'uid', 'uri-id'], $condition);
 		if (DBA::isResult($items)) {
-			$items_unseen = Post::toArray($items);
+			$items_unseen = Post::toArray($items, false);
 			$arr = ['items' => $items_unseen];
 			Hook::callAll('network_ping', $arr);
 
diff --git a/src/Model/APContact.php b/src/Model/APContact.php
index 863496dbb..cc84df4a5 100644
--- a/src/Model/APContact.php
+++ b/src/Model/APContact.php
@@ -235,7 +235,7 @@ class APContact
 		unset($parts['path']);
 
 		if (empty($apcontact['addr'])) {
-			if (!empty($apcontact['nick'])) {
+			if (!empty($apcontact['nick']) && is_array($parts)) {
 				$apcontact['addr'] = $apcontact['nick'] . '@' . str_replace('//', '', Network::unparseURL($parts));
 			} else {
 				$apcontact['addr'] = '';
diff --git a/src/Object/Post.php b/src/Object/Post.php
index 6973fd236..2e6eb1bf6 100644
--- a/src/Object/Post.php
+++ b/src/Object/Post.php
@@ -887,8 +887,13 @@ class Post
 
 		$terms = Tag::getByURIId($item['uri-id'], [Tag::MENTION, Tag::IMPLICIT_MENTION, Tag::EXCLUSIVE_MENTION]);
 		foreach ($terms as $term) {
+			if (!$term['url']) {
+				DI::logger()->warning('Mention term with no URL', ['term' => $term]);
+				continue;
+			}
+
 			$profile = Contact::getByURL($term['url'], false, ['addr', 'contact-type']);
-			if (!empty($profile['addr']) && ((($profile['contact-type'] ?? '') ?: Contact::TYPE_UNKNOWN) != Contact::TYPE_COMMUNITY) &&
+			if (!empty($profile['addr']) && (($profile['contact-type'] ?? Contact::TYPE_UNKNOWN) != Contact::TYPE_COMMUNITY) &&
 				($profile['addr'] != $owner['addr']) && !strstr($text, $profile['addr'])) {
 				$text .= '@' . $profile['addr'] . ' ';
 			}
@@ -945,9 +950,9 @@ class Post
 				'$qcomment'    => $qcomment,
 				'$default'     => $default_text,
 				'$profile_uid' => $uid,
-				'$mylink'      => DI::baseUrl()->remove($a->contact['url']),
+				'$mylink'      => DI::baseUrl()->remove($a->contact['url'] ?? ''),
 				'$mytitle'     => DI::l10n()->t('This is you'),
-				'$myphoto'     => DI::baseUrl()->remove($a->contact['thumb']),
+				'$myphoto'     => DI::baseUrl()->remove($a->contact['thumb'] ?? ''),
 				'$comment'     => DI::l10n()->t('Comment'),
 				'$submit'      => DI::l10n()->t('Submit'),
 				'$loading'     => DI::l10n()->t('Loading...'),
diff --git a/src/Util/ParseUrl.php b/src/Util/ParseUrl.php
index 5dee4d3a2..d5c9f02ad 100644
--- a/src/Util/ParseUrl.php
+++ b/src/Util/ParseUrl.php
@@ -695,7 +695,7 @@ class ParseUrl
 	{
 		if (!empty($jsonld['@graph']) && is_array($jsonld['@graph'])) {
 			foreach ($jsonld['@graph'] as $part) {
-				if (!empty($part)) {
+				if (!empty($part) && is_array($part)) {
 					$siteinfo = self::parseParts($siteinfo, $part);
 				}
 			}