diff --git a/snappymail/v/0.0.0/app/libraries/MailSo/Imap/Exceptions/NegativeResponseException.php b/snappymail/v/0.0.0/app/libraries/MailSo/Imap/Exceptions/NegativeResponseException.php
index 14d8791b7..8dfaaf467 100644
--- a/snappymail/v/0.0.0/app/libraries/MailSo/Imap/Exceptions/NegativeResponseException.php
+++ b/snappymail/v/0.0.0/app/libraries/MailSo/Imap/Exceptions/NegativeResponseException.php
@@ -25,7 +25,7 @@ class NegativeResponseException extends ResponseException
 
 		$oResponse = $this->GetLastResponse();
 		if ($oResponse && $oResponse->IsStatusResponse && !empty($oResponse->HumanReadable) &&
-			isset($oResponse->OptionalResponse[0]) && 'ALERT' === $oResponse->OptionalResponse[0])
+			'ALERT' === ($oResponse->OptionalResponse[0] ?? ''))
 		{
 			$sResult = $oResponse->HumanReadable;
 		}
diff --git a/snappymail/v/0.0.0/app/libraries/MailSo/Imap/Exceptions/ResponseException.php b/snappymail/v/0.0.0/app/libraries/MailSo/Imap/Exceptions/ResponseException.php
index 1eac5eaee..464cf4c65 100644
--- a/snappymail/v/0.0.0/app/libraries/MailSo/Imap/Exceptions/ResponseException.php
+++ b/snappymail/v/0.0.0/app/libraries/MailSo/Imap/Exceptions/ResponseException.php
@@ -27,7 +27,7 @@ class ResponseException extends \MailSo\Imap\Exceptions\Exception
 	{
 		$this->oResponses = $oResponses;
 		if (!$sMessage && $response = $this->GetLastResponse()) {
-			$sMessage = $response->OptionalResponse[0] . ' ' . $response->HumanReadable;
+			$sMessage = ($response->OptionalResponse[0] ?? '') . ' ' . $response->HumanReadable;
 		}
 		parent::__construct($sMessage, $iCode, $oPrevious);
 	}