Error “Undefined array key”

When updating a record using “wp_post_update,” it shows the error “Undefined array key replace_iframe_tags” in advanced_iframe.php on line 1136.

The modification is done correctly, but I would still like it not to show the error.

I have modified the advanced_iframe.php file on that line, changing it from:

PHP

if ($devOptions['replace_iframe_tags'] !== 'true') {
    return $content;
}

to:

PHP

if (!isset($devOptions['replace_iframe_tags']) || $devOptions['replace_iframe_tags'] !== 'true') {
    return $content;
}

But when the plugin is updated, this change is removed.