in can change this
<?php
$accounts = SmtpAccount::objects()->filter(['active' => 1]);
foreach ($accounts as $account) {
$id = $account->getId();
$email = sprintf('%s <%s>',
$account->email->getName(),
$account->email->getEmail());
?>
<option value="<?php echo $id; ?>"<?php
echo ($config['default_smtp_id'] == $id) ? 'selected="selected"' : ''; ?>><?php
echo $email; ?></option>
<?php
}
?>
to this
<?php
$accounts = SmtpAccount::objects()->filter(['active' => 1]);
foreach ($accounts as $account) {
$id = $account->getId();
if ($account->email !== null) {
$email = sprintf('%s <%s>',
$account->email->getName(),
$account->email->getEmail());
?>
<option value="<?php echo $id; ?>"<?php
echo ($config['default_smtp_id'] == $id) ? 'selected="selected"' : ''; ?>><?php
echo $email; ?></option>
<?php
}
}
?>
try, for me this fix solve
let me know