diff --git a/src/Content/Nav.php b/src/Content/Nav.php
index c3e0218573..4a9c71ce9f 100644
--- a/src/Content/Nav.php
+++ b/src/Content/Nav.php
@@ -171,20 +171,24 @@ class Nav
 		}
 
 		if (local_user()) {
-			// user menu
-			$nav['usermenu'][] = ['profile/' . $a->user['nickname'], DI::l10n()->t('Status'), '', DI::l10n()->t('Your posts and conversations')];
-			$nav['usermenu'][] = ['profile/' . $a->user['nickname'] . '/profile', DI::l10n()->t('Profile'), '', DI::l10n()->t('Your profile page')];
-			$nav['usermenu'][] = ['photos/' . $a->user['nickname'], DI::l10n()->t('Photos'), '', DI::l10n()->t('Your photos')];
-			$nav['usermenu'][] = ['videos/' . $a->user['nickname'], DI::l10n()->t('Videos'), '', DI::l10n()->t('Your videos')];
-			$nav['usermenu'][] = ['events/', DI::l10n()->t('Events'), '', DI::l10n()->t('Your events')];
-			$nav['usermenu'][] = ['notes/', DI::l10n()->t('Personal notes'), '', DI::l10n()->t('Your personal notes')];
+			if (!empty($a->user)) {
+				// user menu
+				$nav['usermenu'][] = ['profile/' . $a->user['nickname'], DI::l10n()->t('Status'), '', DI::l10n()->t('Your posts and conversations')];
+				$nav['usermenu'][] = ['profile/' . $a->user['nickname'] . '/profile', DI::l10n()->t('Profile'), '', DI::l10n()->t('Your profile page')];
+				$nav['usermenu'][] = ['photos/' . $a->user['nickname'], DI::l10n()->t('Photos'), '', DI::l10n()->t('Your photos')];
+				$nav['usermenu'][] = ['videos/' . $a->user['nickname'], DI::l10n()->t('Videos'), '', DI::l10n()->t('Your videos')];
+				$nav['usermenu'][] = ['events/', DI::l10n()->t('Events'), '', DI::l10n()->t('Your events')];
+				$nav['usermenu'][] = ['notes/', DI::l10n()->t('Personal notes'), '', DI::l10n()->t('Your personal notes')];
 
-			// user info
-			$contact = DBA::selectFirst('contact', ['micro'], ['uid' => $a->user['uid'], 'self' => true]);
-			$userinfo = [
-				'icon' => (DBA::isResult($contact) ? DI::baseUrl()->remove($contact['micro']) : 'images/person-48.jpg'),
-				'name' => $a->user['username'],
-			];
+				// user info
+				$contact = DBA::selectFirst('contact', ['micro'], ['uid' => $a->user['uid'], 'self' => true]);
+				$userinfo = [
+					'icon' => (DBA::isResult($contact) ? DI::baseUrl()->remove($contact['micro']) : 'images/person-48.jpg'),
+					'name' => $a->user['username'],
+				];
+			} else {
+				DI::logger()->warning('Empty $a->user for local user'. ['local_user' => local_user(), '$a' => $a]);
+			}
 		}
 
 		// "Home" should also take you home from an authenticated remote profile connection
diff --git a/src/Module/Profile/Status.php b/src/Module/Profile/Status.php
index 75ba60cb26..9ab15a4e36 100644
--- a/src/Module/Profile/Status.php
+++ b/src/Module/Profile/Status.php
@@ -34,6 +34,7 @@ use Friendica\Model\Profile as ProfileModel;
 use Friendica\Model\User;
 use Friendica\Module\BaseProfile;
 use Friendica\Module\Security\Login;
+use Friendica\Network\HTTPException;
 use Friendica\Util\DateTimeFormat;
 use Friendica\Util\Security;
 use Friendica\Util\Strings;
@@ -49,6 +50,10 @@ class Status extends BaseProfile
 
 		ProfileModel::load($a, $parameters['nickname']);
 
+		if (empty($a->profile)) {
+			throw new HTTPException\NotFoundException(DI::l10n()->t('User not found.'));
+		}
+
 		if (!$a->profile['net-publish']) {
 			DI::page()['htmlhead'] .= '<meta content="noindex, noarchive" name="robots" />' . "\n";
 		}
diff --git a/src/Module/Xrd.php b/src/Module/Xrd.php
index 1a7b0712f5..249c143ffb 100644
--- a/src/Module/Xrd.php
+++ b/src/Module/Xrd.php
@@ -85,6 +85,11 @@ class Xrd extends BaseModule
 
 		$owner = User::getOwnerDataById($user['uid']);
 
+		if (empty($owner)) {
+			DI::logger()->warning('No owner data for user id', ['uri' => $uri, 'name' => $name, 'user' => $user]);
+			throw new \Friendica\Network\HTTPException\NotFoundException();
+		}
+
 		$alias = str_replace('/profile/', '/~', $owner['url']);
 
 		$avatar = Photo::selectFirst(['type'], ['uid' => $owner['uid'], 'profile' => true]);