Email import failure on new install

I corrected the error by adding a line in public/legacy/include/HtmlSanitizer.php though I have to imagine that there’s something else going on that causes this. Anyway, it’s working for the moment after adding the if statement below, around line 116:

    public static function cleanHtml($dirtyHtml, $removeHtml = false)
    {
        if (!is_string($dirtyHtml)) $dirtyHtml = '';
        return self::getInstance()->clean($dirtyHtml, $removeHtml);
    }