@qiangxue Yeah, look...

Php side code:

```php
return $this->not !== $in ? null : [$this->message, []];
```

Other representation of this code:

```php
if ($this->not === $in) {
    return [$this->message, []];
}
```

So there was just typo in js code, which now fixed and validaton for fine for both server and client side.