diff --git a/lib/private/Mail/EMailTemplate.php b/lib/private/Mail/EMailTemplate.php
index 05a884a67fa64..b3654f303824a 100644
--- a/lib/private/Mail/EMailTemplate.php
+++ b/lib/private/Mail/EMailTemplate.php
@@ -435,6 +435,7 @@ public function addBodyText(string $text, $plainText = '') {
 			$text = htmlspecialchars($text);
 		}
 
+		$this->ensureBodyListClosed();
 		$this->ensureBodyIsOpened();
 
 		$this->htmlBody .= vsprintf($this->bodyText, [$text]);