diff --git a/src/Content/OEmbed.php b/src/Content/OEmbed.php
index 7adff89086..0093ba11af 100644
--- a/src/Content/OEmbed.php
+++ b/src/Content/OEmbed.php
@@ -86,8 +86,7 @@ class OEmbed
 				$redirects = 0;
 				$html_text = Network::fetchUrl($embedurl, false, $redirects, 15, 'text/*');
 				if ($html_text) {
-					$dom = new DOMDocument();
-					$dom->loadHTML($html_text);
+					$dom = @DOMDocument::loadHTML($html_text);
 					if ($dom) {
 						$xpath = new DOMXPath($dom);
 						$entries = $xpath->query("//link[@type='application/json+oembed']");
@@ -275,8 +274,7 @@ class OEmbed
 			$html_text = mb_convert_encoding($text, 'HTML-ENTITIES', mb_detect_encoding($text));
 
 			// If it doesn't parse at all, just return the text.
-			$dom = new DOMDocument();
-			$dom->loadHTML($html_text);
+			$dom = @DOMDocument::loadHTML($html_text);
 			if (!$dom) {
 				return $text;
 			}
diff --git a/src/Content/Widget/ContactBlock.php b/src/Content/Widget/ContactBlock.php
index 33f72af40e..fdc7a470f7 100644
--- a/src/Content/Widget/ContactBlock.php
+++ b/src/Content/Widget/ContactBlock.php
@@ -57,9 +57,9 @@ class ContactBlock
 
 		$contacts_title = L10n::t('No contacts');
 
-		if (!$total) {
-			$micropro = [];
-		} else {
+		$micropro = [];
+
+		if ($total) {
 			// Only show followed for personal accounts, followers for pages
 			if (defaults($profile, 'account-type', User::ACCOUNT_TYPE_PERSON) == User::ACCOUNT_TYPE_PERSON) {
 				$rel = [Contact::FOLLOWER, Contact::FRIEND];
diff --git a/src/Module/Inbox.php b/src/Module/Inbox.php
index 8842c66bcb..c075dd6a63 100644
--- a/src/Module/Inbox.php
+++ b/src/Module/Inbox.php
@@ -10,6 +10,7 @@ use Friendica\Protocol\ActivityPub;
 use Friendica\Core\System;
 use Friendica\Database\DBA;
 use Friendica\Util\HTTPSignature;
+use Friendica\Core\Config;
 
 /**
  * ActivityPub Inbox
diff --git a/src/Protocol/DFRN.php b/src/Protocol/DFRN.php
index 5e6c733e21..52790d46dd 100644
--- a/src/Protocol/DFRN.php
+++ b/src/Protocol/DFRN.php
@@ -2512,7 +2512,7 @@ class DFRN
 		}
 
 		$notice_info = $xpath->query("statusnet:notice_info", $entry);
-		if ($notice_info && ($notice_info->length > 0)) {
+		if ($notice_info && ($notice_info->length > 0) && !empty($notice_info->item)) {
 			foreach ($notice_info->item[0]->attributes as $attributes) {
 				if ($attributes->name == "source") {
 					$item["app"] = strip_tags($attributes->textContent);
@@ -2588,7 +2588,7 @@ class DFRN
 		$item['conversation-uri'] = XML::getFirstNodeValue($xpath, 'ostatus:conversation/text()', $entry);
 
 		$conv = $xpath->query('ostatus:conversation', $entry);
-		if (is_object($conv->item[0])) {
+		if (!empty($conv->item[0])) {
 			foreach ($conv->item[0]->attributes as $attributes) {
 				if ($attributes->name == "ref") {
 					$item['conversation-uri'] = $attributes->textContent;
@@ -2603,7 +2603,7 @@ class DFRN
 		$item["parent-uri"] = $item["uri"];
 
 		$inreplyto = $xpath->query("thr:in-reply-to", $entry);
-		if (is_object($inreplyto->item[0])) {
+		if (!empty($inreplyto->item[0])) {
 			foreach ($inreplyto->item[0]->attributes as $attributes) {
 				if ($attributes->name == "ref") {
 					$item["parent-uri"] = $attributes->textContent;
diff --git a/src/Protocol/OStatus.php b/src/Protocol/OStatus.php
index b2d0004c06..45071f82e2 100644
--- a/src/Protocol/OStatus.php
+++ b/src/Protocol/OStatus.php
@@ -53,7 +53,7 @@ class OStatus
 	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 * @throws \ImagickException
 	 */
-	private static function fetchAuthor(DOMXPath $xpath, $context, array $importer, array &$contact, $onlyfetch)
+	private static function fetchAuthor(DOMXPath $xpath, $context, array $importer, array &$contact = null, $onlyfetch)
 	{
 		$author = [];
 		$author["author-link"] = XML::getFirstNodeValue($xpath, 'atom:author/atom:uri/text()', $context);
@@ -322,7 +322,7 @@ class OStatus
 	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 * @throws \ImagickException
 	 */
-	private static function process($xml, array $importer, array &$contact, &$hub, $stored = false, $initialize = true)
+	private static function process($xml, array $importer, array &$contact = null, &$hub, $stored = false, $initialize = true)
 	{
 		if ($initialize) {
 			self::$itemlist = [];
diff --git a/src/Worker/Notifier.php b/src/Worker/Notifier.php
index 9e5430e8fa..512fbe8844 100644
--- a/src/Worker/Notifier.php
+++ b/src/Worker/Notifier.php
@@ -152,7 +152,7 @@ class Notifier
 		if (!empty($target_item) && !empty($items)) {
 			$parent = $items[0];
 
-			$delivery_queue_count += self::activityPubDelivery($cmd, $target_item, $parent, $a->queue['priority'], $a->query_string['created']);
+			$delivery_queue_count += self::activityPubDelivery($cmd, $target_item, $parent, $a->queue['priority'], $a->queue['created']);
 
 			$fields = ['network', 'author-id', 'owner-id'];
 			$condition = ['uri' => $target_item["thr-parent"], 'uid' => $target_item["uid"]];