diff --git a/lib/Listener/LoadMenuEntriesListener.php b/lib/Listener/LoadMenuEntriesListener.php
index a5d2f80ce..9d34fbf95 100644
--- a/lib/Listener/LoadMenuEntriesListener.php
+++ b/lib/Listener/LoadMenuEntriesListener.php
@@ -54,6 +54,11 @@ public function handle(Event $event): void {
 			if ($menuEntry->getAdminRequired() === 1 && !$isUserAdmin) {
 				continue; // Skip this entry if the user is not an admin and the entry requires admin privileges
 			}
+			if ($menuEntry->getDisplayName() === '') {
+				// An entry without a label is not renderable, and translating an empty string
+				// throws since the L10N strict types refactoring.
+				continue;
+			}
 			$navigationManager->add(static function () use ($menuEntry) {
 				$appId = $menuEntry->getAppid();
 				$entryName = $menuEntry->getName();
diff --git a/lib/Notifications/ExAppNotifier.php b/lib/Notifications/ExAppNotifier.php
index 23b6c3d97..6efba3888 100644
--- a/lib/Notifications/ExAppNotifier.php
+++ b/lib/Notifications/ExAppNotifier.php
@@ -55,10 +55,13 @@ public function prepare(INotification $notification, string $languageCode): INot
 		}
 		$notification->setIcon($this->url->getAbsoluteURL($this->url->imagePath(Application::APP_ID, 'app-dark.svg')));
 
-		if (isset($parameters['rich_subject']) && isset($parameters['rich_subject_params'])) {
+		// Empty strings are rejected on both sides: `t('')` throws since the L10N strict types
+		// refactoring, and `setRichSubject('')`/`setRichMessage('')` throw an InvalidValueException.
+		// A notification without a message is valid, so skip what the ExApp did not provide.
+		if (isset($parameters['rich_subject'], $parameters['rich_subject_params']) && $parameters['rich_subject'] !== '') {
 			$notification->setRichSubject($l->t($parameters['rich_subject']), $parameters['rich_subject_params']);
 		}
-		if (isset($parameters['rich_message']) && isset($parameters['rich_message_params'])) {
+		if (isset($parameters['rich_message'], $parameters['rich_message_params']) && $parameters['rich_message'] !== '') {
 			$notification->setRichMessage($l->t($parameters['rich_message']), $parameters['rich_message_params']);
 		}