TypeError: in_array(): Argument #2 ($haystack) must be of type array, null given in in_array() (line 79 of ../node_css.module).

The release was too early as, unfortunately, this bug has been spotted:

```php
TypeError: in_array(): Argument #2 ($haystack) must be of type array, null given in in_array() (line 79 of ../node_css/node_css.module).
```