diff --git a/lib/private/TaskProcessing/Manager.php b/lib/private/TaskProcessing/Manager.php
index cfd0ccf143a..ad5bf132445 100644
--- a/lib/private/TaskProcessing/Manager.php
+++ b/lib/private/TaskProcessing/Manager.php
@@ -814,7 +814,7 @@ class Manager implements IManager {
 
 	public function getAvailableTaskTypes(bool $showDisabled = false, ?string $userId = null): array {
 		// userId will be obtained from the session if left to null
-		if (!$this->checkGuestAccess($userId)) { 
+		if (!$this->checkGuestAccess($userId)) {
 			return [];
 		}
 		if ($this->availableTaskTypes === null) {
@@ -881,11 +881,10 @@ class Manager implements IManager {
 		}
 		if ($userId === null) {
 			$user = $this->userSession->getUser();
-
 		} else {
 			$user = $this->userManager->get($userId);
 		}
-		
+
 		$guestsAllowed = $this->config->getAppValue('core', 'ai.taskprocessing_guests', 'false');
 		if ($guestsAllowed == 'true' || !class_exists(\OCA\Guests\UserBackend::class) || !($user->getBackend() instanceof \OCA\Guests\UserBackend)) {
 			return true;
diff --git a/psalm.xml b/psalm.xml
index 0fdbc287b5a..a8a2a0c8904 100644
--- a/psalm.xml
+++ b/psalm.xml
@@ -106,6 +106,7 @@
 				<referencedClass name="OCA\GroupFolders\Mount\GroupFolderStorage"/>
 				<referencedClass name="OCA\TwoFactorNextcloudNotification\Controller\APIController"/>
 				<referencedClass name="OCA\GlobalSiteSelector\Service\SlaveService"/>
+				<referencedClass name="OCA\Guests\UserBackend"/>
 			</errorLevel>
 		</UndefinedClass>
 		<UndefinedFunction>
diff --git a/tests/lib/TaskProcessing/TaskProcessingTest.php b/tests/lib/TaskProcessing/TaskProcessingTest.php
index 73f67b07266..d463a5e4c61 100644
--- a/tests/lib/TaskProcessing/TaskProcessingTest.php
+++ b/tests/lib/TaskProcessing/TaskProcessingTest.php
@@ -27,6 +27,7 @@ use OCP\IDBConnection;
 use OCP\IServerContainer;
 use OCP\IUser;
 use OCP\IUserManager;
+use OCP\IUserSession;
 use OCP\TaskProcessing\EShapeType;
 use OCP\TaskProcessing\Events\GetTaskProcessingProvidersEvent;
 use OCP\TaskProcessing\Events\TaskFailedEvent;
@@ -608,6 +609,8 @@ class TaskProcessingTest extends \Test\TestCase {
 			$this->userMountCache,
 			\OC::$server->get(IClientService::class),
 			\OC::$server->get(IAppManager::class),
+			$userManager,
+			\OC::$server->get(IUserSession::class),
 			\OC::$server->get(ICacheFactory::class),
 		);
 	}
@@ -1258,6 +1261,8 @@ class TaskProcessingTest extends \Test\TestCase {
 			$this->userMountCache,
 			\OC::$server->get(IClientService::class),
 			\OC::$server->get(IAppManager::class),
+			\OC::$server->get(IUserManager::class),
+			\OC::$server->get(IUserSession::class),
 			\OC::$server->get(ICacheFactory::class),
 		);
 	}