BookStack\User::getAvatar PHP Method

    public function getAvatar($size = 50)
    {
        if ($this->image_id === 0 || $this->image_id === '0' || $this->image_id === null) {
            return baseUrl('/user_avatar.png');
        }
        return baseUrl($this->avatar->getThumb($size, $size, false));
    }