diff --git a/lib/Controller/UserApiController.php b/lib/Controller/UserApiController.php
index a5ef90a475e..ddb406cb530 100644
--- a/lib/Controller/UserApiController.php
+++ b/lib/Controller/UserApiController.php
@@ -8,21 +8,18 @@
 use OCP\Collaboration\Collaborators\ISearch;
 use \OCP\IRequest;
 use OCP\IUserManager;
-use OCP\IUserSession;
 use OCP\Share\IShare;
 
 class UserApiController extends ApiController {
 	private ISearch $collaboratorSearch;
-	private IUserSession $userSession;
 	private IUserManager $userManager;
 	private SessionService $sessionService;
 
-	public function __construct($appName, IRequest $request, SessionService $sessionService, ISearch $ISearch, IUserManager $userManager, IUserSession $userSession) {
+	public function __construct($appName, IRequest $request, SessionService $sessionService, ISearch $ISearch, IUserManager $userManager) {
 		parent::__construct($appName, $request);
 
 		$this->sessionService = $sessionService;
 		$this->collaboratorSearch = $ISearch;
-		$this->userSession = $userSession;
 		$this->userManager = $userManager;
 	}
 
@@ -43,7 +40,10 @@ public function index(int $documentId, int $sessionId, string $sessionToken, str
 		foreach ($sessions as $session) {
 			$sessionUserId = $session['userId'];
 			if ($sessionUserId !== null && !isset($users[$sessionUserId])) {
-				$users[$sessionUserId] = $this->userManager->getDisplayName($sessionUserId);
+				$displayName = $this->userManager->getDisplayName($sessionUserId);
+				if (stripos($displayName, $filter) !== false) {
+					$users[$sessionUserId] = $displayName;
+				}
 			}
 		}
 
@@ -51,16 +51,14 @@ public function index(int $documentId, int $sessionId, string $sessionToken, str
 		if ($currentSession->getUserId() !== null) {
 			// Add other users to the autocomplete list
 			[$result] = $this->collaboratorSearch->search($filter, [IShare::TYPE_USER], false, $limit, 0);
+			$userSearch = array_merge($result['users'], $result['exact']['users']);
 
-			foreach ($result['users'] as ['label' => $label, 'value' => $value]) {
+			foreach ($userSearch as ['label' => $label, 'value' => $value]) {
 				if (isset($value['shareWith'])) {
 					$id = $value['shareWith'];
 					$users[$id] = $label;
 				}
 			}
-
-			$user = $this->userSession->getUser();
-			$users[$user->getUID()] = $user->getDisplayName();
 		}
 
 		return new DataResponse($users);
diff --git a/tests/unit/Controller/UserApiControllerTest.php b/tests/unit/Controller/UserApiControllerTest.php
new file mode 100644
index 00000000000..96462edc824
--- /dev/null
+++ b/tests/unit/Controller/UserApiControllerTest.php
@@ -0,0 +1,116 @@
+<?php
+
+namespace OCA\Text\Controller;
+
+use OCA\Text\Service\SessionService;
+use OCP\Collaboration\Collaborators\ISearch;
+use OCP\AppFramework\Http\DataResponse;
+use \OCP\IRequest;
+use OCP\IUserManager;
+use OCP\IUserSession;
+use OCA\Text\Db\Session;
+use Test\TestCase;
+
+class UserApiControllerTest extends TestCase {
+	/**
+	 * @var \PHPUnit\Framework\MockObject\MockObject
+	 */
+	private $collaboratorSearch;
+	/**
+	 * @var \PHPUnit\Framework\MockObject\MockObject
+	 */
+	private $userSession;
+	/**
+	 * @var \PHPUnit\Framework\MockObject\MockObject
+	 */
+	private $userManager;
+	/**
+	 * @var \PHPUnit\Framework\MockObject\MockObject
+	 */
+	private $sessionService;
+	/**
+	 * @var UserApiController
+	 */
+	private $userApiController;
+	/**
+	 * @var IRequest|\PHPUnit\Framework\MockObject\MockObject
+	 */
+	private $request;
+
+	protected function setUp(): void {
+		parent::setUp();
+		$this->request = $this->createMock(IRequest::class);
+		$this->collaboratorSearch = $this->createMock(ISearch::class);
+		$this->userSession = $this->createMock(IUserSession::class);
+		$this->userManager = $this->createMock(IUserManager::class);
+		$this->sessionService = $this->createMock(SessionService::class);
+		$this->userApiController = new UserApiController(
+			'text',
+			$this->request,
+			$this->sessionService,
+			$this->collaboratorSearch,
+			$this->userManager,
+			$this->userSession
+		);
+	}
+
+	/**
+	 * @dataProvider dataTestUsersIndex
+	 */
+	public function testUsersIndex(int $documentId, int $sessionId, string $sessionToken, string $filter) {
+		$session = new Session();
+		$session->setUserId('admin');
+		$this->sessionService
+			->expects($this->once())
+			->method('isValidSession')->willReturn(true);
+		$this->sessionService
+			->expects($this->once())
+			->method('getAllSessions')->willReturn([[
+				'userId' => 'admin',
+				'displayName' => 'admin',
+			]]);
+		$this->sessionService
+			->expects($this->once())
+			->method('getSession')->willReturn($session);
+		$this->collaboratorSearch
+			->expects($this->once())
+			->method('search')->willReturn([
+				[
+					'exact' => [
+						'users' => []
+					],
+					'users' => [
+						[
+							'label' => 'admin',
+							'subline' => '',
+							'icon' => 'icon-user',
+							'value' => [
+								'shareType' => 0,
+								'shareWith' => 'admin'
+							],
+							'shareWithDisplayNameUnique' => 'admin',
+							'status' => []
+						],
+					]
+				]
+			]);
+
+		$response = $this->userApiController->index(
+			$documentId,
+			$sessionId,
+			$sessionToken,
+			$filter
+		);
+		$this->assertInstanceOf(DataResponse::class, $response);
+		$this->assertIsArray($response->getData());
+		$this->assertSame(['admin' => 'admin'], $response->getData());
+	}
+
+	public function dataTestUsersIndex() {
+		return [
+			[103, 44, 'token1', 'admin'],
+			[103, 44, 'token2', 'admin'],
+			[103, 44, 'token3', 'admin'],
+		];
+	}
+}