diff --git a/include/enotify.php b/include/enotify.php
index 1edad36ac0..409fc66fac 100644
--- a/include/enotify.php
+++ b/include/enotify.php
@@ -184,9 +184,9 @@ function notification($params)
 		// First go for the general message
 
 		// "George Bull's post"
-		if ($params['activity']['origin_comment']) {
+		if (!empty($params['activity']['origin_comment'])) {
 			$message = $l10n->t('%1$s replied to you on %2$s\'s %3$s %4$s');
-		} elseif ($params['activity']['explicit_tagged']) {
+		} elseif (!empty($params['activity']['explicit_tagged'])) {
 			$message = $l10n->t('%1$s tagged you on %2$s\'s %3$s %4$s');
 		} else {
 			$message = $l10n->t('%1$s commented on %2$s\'s %3$s %4$s');
@@ -197,10 +197,10 @@ function notification($params)
 		// Then look for the special cases
 
 		// "your post"
-		if ($params['activity']['origin_thread']) {
-			if ($params['activity']['origin_comment']) {
+		if (!empty($params['activity']['origin_thread'])) {
+			if (!empty($params['activity']['origin_comment'])) {
 				$message = $l10n->t('%1$s replied to you on your %2$s %3$s');
-			} elseif ($params['activity']['explicit_tagged']) {
+			} elseif (!empty($params['activity']['explicit_tagged'])) {
 				$message = $l10n->t('%1$s tagged you on your %2$s %3$s');
 			} else {
 				$message = $l10n->t('%1$s commented on your %2$s %3$s');
@@ -209,9 +209,9 @@ function notification($params)
 			$dest_str = sprintf($message, $params['source_name'], $item_post_type, $title);
 		// "their post"
 		} elseif ($item['author-link'] == $params['source_link']) {
-			if ($params['activity']['origin_comment']) {
+			if (!empty($params['activity']['origin_comment'])) {
 				$message = $l10n->t('%1$s replied to you on their %2$s %3$s');
-			} elseif ($params['activity']['explicit_tagged']) {
+			} elseif (!empty($params['activity']['explicit_tagged'])) {
 				$message = $l10n->t('%1$s tagged you on their %2$s %3$s');
 			} else {
 				$message = $l10n->t('%1$s commented on their %2$s %3$s');
@@ -224,7 +224,7 @@ function notification($params)
 		// So, we cannot have different subjects for notifications of the same thread.
 		// Before this we have the name of the replier on the subject rendering
 		// different subjects for messages on the same thread.
-		if ($params['activity']['explicit_tagged']) {
+		if (!empty($params['activity']['explicit_tagged'])) {
 			$subject = $l10n->t('%s %s tagged you', $subjectPrefix, $params['source_name']);
 
 			$preamble = $l10n->t('%1$s tagged you at %2$s', $params['source_name'], $sitename);
diff --git a/mod/item.php b/mod/item.php
index 71793f14dc..208477b19a 100644
--- a/mod/item.php
+++ b/mod/item.php
@@ -410,21 +410,22 @@ function item_post(App $a) {
 				}
 			}
 
-			$success = ItemHelper::replaceTag($body, $inform, local_user() ? local_user() : $profile_uid, $tag, $network);
-			if ($success['replaced']) {
-				$tagged[] = $tag;
-			}
-			// When the forum is private or the forum is addressed with a "!" make the post private
-			if (!empty($success['contact']['prv']) || ($tag_type == Tag::TAG_CHARACTER[Tag::EXCLUSIVE_MENTION])) {
-				$private_forum = $success['contact']['prv'];
-				$only_to_forum = ($tag_type == Tag::TAG_CHARACTER[Tag::EXCLUSIVE_MENTION]);
-				$private_id = $success['contact']['id'];
-				$forum_contact = $success['contact'];
-			} elseif (!empty($success['contact']['forum']) && ($str_contact_allow == '<' . $success['contact']['id'] . '>')) {
-				$private_forum = false;
-				$only_to_forum = true;
-				$private_id = $success['contact']['id'];
-				$forum_contact = $success['contact'];
+			if ($success = ItemHelper::replaceTag($body, $inform, local_user() ? local_user() : $profile_uid, $tag, $network)) {
+				if ($success['replaced']) {
+					$tagged[] = $tag;
+				}
+				// When the forum is private or the forum is addressed with a "!" make the post private
+				if (!empty($success['contact']['prv']) || ($tag_type == Tag::TAG_CHARACTER[Tag::EXCLUSIVE_MENTION])) {
+					$private_forum = $success['contact']['prv'];
+					$only_to_forum = ($tag_type == Tag::TAG_CHARACTER[Tag::EXCLUSIVE_MENTION]);
+					$private_id = $success['contact']['id'];
+					$forum_contact = $success['contact'];
+				} elseif (!empty($success['contact']['forum']) && ($str_contact_allow == '<' . $success['contact']['id'] . '>')) {
+					$private_forum = false;
+					$only_to_forum = true;
+					$private_id = $success['contact']['id'];
+					$forum_contact = $success['contact'];
+				}
 			}
 		}
 
diff --git a/mod/tagrm.php b/mod/tagrm.php
index e81bd2af38..145f636cc4 100644
--- a/mod/tagrm.php
+++ b/mod/tagrm.php
@@ -81,25 +81,27 @@ function tagrm_content(App $a)
 {
 	$o = '';
 
+	$photo_return = $_SESSION['photo_return'] ?? '';
+
 	if (!local_user()) {
-		DI::baseUrl()->redirect($_SESSION['photo_return']);
+		DI::baseUrl()->redirect($photo_return);
 		// NOTREACHED
 	}
 
 	if ($a->argc == 3) {
 		update_tags($a->argv[1], [Strings::escapeTags(trim(hex2bin($a->argv[2])))]);
-		DI::baseUrl()->redirect($_SESSION['photo_return']);
+		DI::baseUrl()->redirect($photo_return);
 	}
 
 	$item_id = (($a->argc > 1) ? intval($a->argv[1]) : 0);
 	if (!$item_id) {
-		DI::baseUrl()->redirect($_SESSION['photo_return']);
+		DI::baseUrl()->redirect($photo_return);
 		// NOTREACHED
 	}
 
 	$item = Post::selectFirst(['uri-id'], ['id' => $item_id, 'uid' => local_user()]);
 	if (!DBA::isResult($item)) {
-		DI::baseUrl()->redirect($_SESSION['photo_return']);
+		DI::baseUrl()->redirect($photo_return);
 	}
 
 	$tag_text = Tag::getCSVByURIId($item['uri-id']);
@@ -107,7 +109,7 @@ function tagrm_content(App $a)
 	$arr = explode(',', $tag_text);
 
 	if (empty($arr)) {
-		DI::baseUrl()->redirect($_SESSION['photo_return']);
+		DI::baseUrl()->redirect($photo_return);
 	}
 
 	$o .= '<h3>' . DI::l10n()->t('Remove Item Tag') . '</h3>';
diff --git a/src/Content/Item.php b/src/Content/Item.php
index f0d08d48e6..56836903b3 100644
--- a/src/Content/Item.php
+++ b/src/Content/Item.php
@@ -127,16 +127,6 @@ class Item
 			$tag_type = substr($tag, 0, 1);
 			//is it already replaced?
 			if (strpos($tag, '[url=')) {
-				// Checking for the alias that is used for OStatus
-				$pattern = '/[@!]\[url\=(.*?)\](.*?)\[\/url\]/ism';
-				if (preg_match($pattern, $tag, $matches)) {
-					$data = Contact::getByURL($matches[1], false, ['alias', 'nick']);
-
-					if ($data['alias'] != '') {
-						$newtag = '@[url=' . $data['alias'] . ']' . $data['nick'] . '[/url]';
-					}
-				}
-
 				return $replaced;
 			}
 
diff --git a/src/Content/Text/BBCode.php b/src/Content/Text/BBCode.php
index 03ccd889a4..2bb563e74a 100644
--- a/src/Content/Text/BBCode.php
+++ b/src/Content/Text/BBCode.php
@@ -2196,9 +2196,7 @@ class BBCode
 					}
 				}
 
-				$success = Item::replaceTag($body, $inform, $profile_uid, $tag, $network);
-
-				if ($success['replaced']) {
+				if (($success = Item::replaceTag($body, $inform, $profile_uid, $tag, $network)) && $success['replaced']) {
 					$tagged[] = $tag;
 				}
 			}
diff --git a/src/Model/Item.php b/src/Model/Item.php
index 0ca1138f9e..b7267428ab 100644
--- a/src/Model/Item.php
+++ b/src/Model/Item.php
@@ -2864,7 +2864,7 @@ class Item
 						'mime'    => $attachment['mimetype'],
 					],
 				]);
-				if ($item['post-type'] == Item::PT_VIDEO) {
+				if (($item['post-type'] ?? null) == Item::PT_VIDEO) {
 					$leading .= $media;
 				} else {
 					$trailing .= $media;
diff --git a/update.php b/update.php
index 0a97b4e10c..551d208fe4 100644
--- a/update.php
+++ b/update.php
@@ -835,7 +835,7 @@ function update_1404()
 	while ($task = DBA::fetch($tasks)) {
 		$parameters = json_decode($task['parameter'], true);
 	
-		if (in_array($parameters[0], [Delivery::MAIL, Delivery::SUGGESTION, Delivery::REMOVAL, Delivery::RELOCATION])) {
+		if (is_array($parameters) && count($parameters) && in_array($parameters[0], [Delivery::MAIL, Delivery::SUGGESTION, Delivery::REMOVAL, Delivery::RELOCATION])) {
 			continue;
 		}