diff --git a/apps/user_ldap/tests/Group_LDAPTest.php b/apps/user_ldap/tests/Group_LDAPTest.php
index 2f7c0b04cdc31..27a185ee62e6b 100644
--- a/apps/user_ldap/tests/Group_LDAPTest.php
+++ b/apps/user_ldap/tests/Group_LDAPTest.php
@@ -37,7 +37,10 @@
 use OCA\User_LDAP\ILDAPWrapper;
 use OCA\User_LDAP\Mapping\GroupMapping;
 use OCA\User_LDAP\User\Manager;
+use OCA\User_LDAP\User\OfflineUser;
 use OCP\GroupInterface;
+use OCP\IConfig;
+use OCP\Server;
 use PHPUnit\Framework\MockObject\MockObject;
 use Test\TestCase;
 
@@ -49,6 +52,14 @@
  * @package OCA\User_LDAP\Tests
  */
 class Group_LDAPTest extends TestCase {
+
+	public function tearDown(): void {
+		parent::tearDown();
+
+		$realConfig = Server::get(IConfig::class);
+		$realConfig->deleteUserValue('userX', 'user_ldap', 'cached-group-memberships-');
+	}
+
 	public function testCountEmptySearchString() {
 		$access = $this->getAccessMock();
 		$pluginManager = $this->getPluginManagerMock();
@@ -923,6 +934,40 @@ public function testGetUserGroupsMemberOfDisabled() {
 		$groupBackend->getUserGroups('userX');
 	}
 
+	public function testGetUserGroupsOfflineUser() {
+		$access = $this->getAccessMock();
+		$pluginManager = $this->getPluginManagerMock();
+
+		$access->connection = $this->createMock(Connection::class);
+		$access->connection->expects($this->any())
+			->method('__get')
+			->willReturnCallback(function ($name) {
+				if ($name === 'useMemberOfToDetectMembership') {
+					return 0;
+				} elseif ($name === 'ldapDynamicGroupMemberURL') {
+					return '';
+				}
+				return 1;
+			});
+
+		$offlineUser = $this->createMock(OfflineUser::class);
+
+		// FIXME: should be available via CI
+		$realConfig = Server::get(IConfig::class);
+		$realConfig->setUserValue('userX', 'user_ldap', 'cached-group-memberships-', \json_encode(['groupB', 'groupF']));
+
+		$access->userManager->expects($this->any())
+			->method('get')
+			->with('userX')
+			->willReturn($offlineUser);
+
+		$groupBackend = new GroupLDAP($access, $pluginManager);
+		$returnedGroups = $groupBackend->getUserGroups('userX');
+		$this->assertCount(2, $returnedGroups);
+		$this->assertTrue(in_array('groupB', $returnedGroups));
+		$this->assertTrue(in_array('groupF', $returnedGroups));
+	}
+
 	public function nestedGroupsProvider(): array {
 		return [
 			[true],