diff --git a/src/Module/Api/Mastodon/Search.php b/src/Module/Api/Mastodon/Search.php
index 9301c60cdc..c054329dde 100644
--- a/src/Module/Api/Mastodon/Search.php
+++ b/src/Module/Api/Mastodon/Search.php
@@ -196,6 +196,11 @@ class Search extends BaseApi
 		$tags = DBA::select('tag', ['name'], $condition, $params);
 
 		$hashtags = [];
+
+		if (!is_iterable($tags)) {
+			return $hashtags;
+		}
+
 		foreach ($tags as $tag) {
 			if ($version == 1) {
 				$hashtags[] = $tag['name'];
diff --git a/src/Module/Api/Twitter/Lists/Ownership.php b/src/Module/Api/Twitter/Lists/Ownership.php
index bdf34ed280..0b18f6bc18 100644
--- a/src/Module/Api/Twitter/Lists/Ownership.php
+++ b/src/Module/Api/Twitter/Lists/Ownership.php
@@ -48,8 +48,11 @@ class Ownership extends BaseApi
 
 		// loop through all circles
 		$lists = [];
-		foreach ($circles as $circle) {
-			$lists[] = $this->friendicaCircle->createFromId($circle['id']);
+
+		if (is_iterable($circles)) {
+			foreach ($circles as $circle) {
+				$lists[] = $this->friendicaCircle->createFromId($circle['id']);
+			}
 		}
 
 		$this->response->addFormattedContent('statuses', ['lists' => ['lists' => $lists]], $this->parameters['extension'] ?? null, Contact::getPublicIdByUserId($uid));
diff --git a/src/Module/Conversation/Network.php b/src/Module/Conversation/Network.php
index 86c2fcf736..629295f7c8 100644
--- a/src/Module/Conversation/Network.php
+++ b/src/Module/Conversation/Network.php
@@ -59,9 +59,9 @@ class Network extends Timeline
 	protected $dateFrom;
 	/** @var string */
 	protected $dateTo;
-	/** @var int */
+	/** @var bool */
 	protected $star;
-	/** @var int */
+	/** @var bool */
 	protected $mention;
 
 	/** @var AppHelper */
diff --git a/src/Module/Filer/RemoveTag.php b/src/Module/Filer/RemoveTag.php
index 330f6953a6..28666c8a44 100644
--- a/src/Module/Filer/RemoveTag.php
+++ b/src/Module/Filer/RemoveTag.php
@@ -11,7 +11,6 @@ use Friendica\App;
 use Friendica\BaseModule;
 use Friendica\Core\L10n;
 use Friendica\Core\Session\Capability\IHandleUserSessions;
-use Friendica\Core\System;
 use Friendica\Database\DBA;
 use Friendica\Model\Post;
 use Friendica\Module\Response;
@@ -59,15 +58,15 @@ class RemoveTag extends BaseModule
 	}
 
 	/**
-	 * @param array       $request The $_REQUEST array
-	 * @param string|null $type    Output parameter with the computed type
-	 * @param string|null $term    Output parameter with the computed term
+	 * @param array           $request The $_REQUEST array
+	 * @param string|int|null $type    Output parameter with the computed type
+	 * @param string|null     $term    Output parameter with the computed term
 	 *
 	 * @return int The relevant HTTP code
 	 *
 	 * @throws \Exception
 	 */
-	private function removeTag(array $request, string &$type = null, string &$term = null): int
+	private function removeTag(array $request, &$type = null, string &$term = null): int
 	{
 		$item_id = $this->parameters['id'] ?? 0;