diff --git a/src/Util/EMailer/MailBuilder.php b/src/Util/EMailer/MailBuilder.php
index e6b745b979..321bdc9e6b 100644
--- a/src/Util/EMailer/MailBuilder.php
+++ b/src/Util/EMailer/MailBuilder.php
@@ -119,7 +119,7 @@ abstract class MailBuilder
 	{
 		$this->recipientUid = $user['uid'] ?? 0;
 		try {
-			$this->l10n = $user['language'] ? $this->l10n->withLang($user['language']) : $this->l10n;
+			$this->l10n = isset($user['language']) ? $this->l10n->withLang($user['language']) : $this->l10n;
 		} catch (Exception $e) {
 			$this->logger->warning('cannot use language.', ['user' => $user, 'exception' => $e]);
 		}