diff --git a/htdocs/includes/swiftmailer/egulias/email-validator/EmailValidator/Validation/NoRFCWarningsValidation.php b/htdocs/includes/swiftmailer/egulias/email-validator/EmailValidator/Validation/NoRFCWarningsValidation.php
index e4bf0cc4df9..f3656b35a52 100644
--- a/htdocs/includes/swiftmailer/egulias/email-validator/EmailValidator/Validation/NoRFCWarningsValidation.php
+++ b/htdocs/includes/swiftmailer/egulias/email-validator/EmailValidator/Validation/NoRFCWarningsValidation.php
@@ -22,7 +22,8 @@ class NoRFCWarningsValidation extends RFCValidation
             return false;
         }
 
-        if (empty($this->getWarnings())) {
+        $ret = $this->getWarnings();
+        if (empty($ret)) {
             return true;
         }