ValueError("Invalid value for `stored_versions`, must not be `None`") when  calling list_custom_resource_definition

When I try using the list_custom_resource_definition method, I get the error: 
```
ValueError("Invalid value for `stored_versions`, must not be `None`")
```
The output of `kubectl get crds -o yaml` doesn't include a field called `stored_versions`

I'm trying to get the list of crds installed. 
Using Python 2.7 with Kubernetes 1.10.3