diff --git a/src/Module/Moderation/Users/Active.php b/src/Module/Moderation/Users/Active.php
index 24634157b5..b16efa46ae 100644
--- a/src/Module/Moderation/Users/Active.php
+++ b/src/Module/Moderation/Users/Active.php
@@ -48,15 +48,18 @@ class Active extends BaseUsers
 	{
 		parent::content();
 
-		$action = $this->parameters['action'] ?? '';
-		$uid    = $this->parameters['uid']    ?? 0;
+		$action = (string) $this->parameters['action'] ?? '';
+		$uid    = (int) $this->parameters['uid'] ?? 0;
 
-		if ($uid) {
-			$user = User::getById($uid, ['username', 'blocked']);
-			if (!$user) {
-				$this->systemMessages->addNotice($this->t('User not found'));
-				$this->baseUrl->redirect('moderation/users');
-			}
+		if ($uid === 0) {
+			$this->systemMessages->addNotice($this->t('User not found'));
+			$this->baseUrl->redirect('moderation/users');
+		}
+
+		$user = User::getById($uid, ['username', 'blocked']);
+		if (!is_array($user)) {
+			$this->systemMessages->addNotice($this->t('User not found'));
+			$this->baseUrl->redirect('moderation/users');
 		}
 
 		switch ($action) {
diff --git a/src/Module/Moderation/Users/Blocked.php b/src/Module/Moderation/Users/Blocked.php
index fd8d25dfbe..6eeb11549f 100644
--- a/src/Module/Moderation/Users/Blocked.php
+++ b/src/Module/Moderation/Users/Blocked.php
@@ -48,15 +48,18 @@ class Blocked extends BaseUsers
 	{
 		parent::content();
 
-		$action = $this->parameters['action'] ?? '';
-		$uid    = $this->parameters['uid']    ?? 0;
+		$action = (string) $this->parameters['action'] ?? '';
+		$uid    = (int) $this->parameters['uid'] ?? 0;
 
-		if ($uid) {
-			$user = User::getById($uid, ['username', 'blocked']);
-			if (!$user) {
-				$this->systemMessages->addNotice($this->t('User not found'));
-				$this->baseUrl->redirect('moderation/users');
-			}
+		if ($uid === 0) {
+			$this->systemMessages->addNotice($this->t('User not found'));
+			$this->baseUrl->redirect('moderation/users');
+		}
+
+		$user = User::getById($uid, ['username', 'blocked']);
+		if (!is_array($user)) {
+			$this->systemMessages->addNotice($this->t('User not found'));
+			$this->baseUrl->redirect('moderation/users');
 		}
 
 		switch ($action) {
diff --git a/src/Module/Moderation/Users/Index.php b/src/Module/Moderation/Users/Index.php
index 6553bcc7e3..1a7d8f1721 100644
--- a/src/Module/Moderation/Users/Index.php
+++ b/src/Module/Moderation/Users/Index.php
@@ -55,15 +55,18 @@ class Index extends BaseUsers
 	{
 		parent::content();
 
-		$action = $this->parameters['action'] ?? '';
-		$uid    = $this->parameters['uid']    ?? 0;
+		$action = (string) $this->parameters['action'] ?? '';
+		$uid    = (int) $this->parameters['uid'] ?? 0;
 
-		if ($uid) {
-			$user = User::getById($uid, ['username', 'blocked']);
-			if (!$user) {
-				$this->systemMessages->addNotice($this->t('User not found'));
-				$this->baseUrl->redirect('moderation/users');
-			}
+		if ($uid === 0) {
+			$this->systemMessages->addNotice($this->t('User not found'));
+			$this->baseUrl->redirect('moderation/users');
+		}
+
+		$user = User::getById($uid, ['username', 'blocked']);
+		if (!is_array($user)) {
+			$this->systemMessages->addNotice($this->t('User not found'));
+			$this->baseUrl->redirect('moderation/users');
 		}
 
 		switch ($action) {