[PHP 7.4] Notice: Trying to access array offset on value of type null

Getting the following error when trying to install **front/wp-cli-build**: 

```
Error: Package installation failed.
Reverted composer.json.
PHP Notice:  Trying to access array offset on value of type null in phar:///usr/local/bin/wp/vendor/wp-cli/package-command/src/Package_Command.php on line 1244
```

**PHP 7.4.7**