undefined method `[]' for nil:NilClass after setting host name

[jkugler]

Possibly related to #124, which was closed.
I am getting this with vagrant-vsphere 1.13.2 and vagrant 2.2.4. This is what I get in my test kichen output:

-----> Creating <source-centos-6-bento>...
       Bringing machine 'default' up with 'vsphere' provider...
       ==> default: Calling vSphere CloneVM with the following settings:
       ==> default:  -- Template VM: B5 Lab - Folder/vm/CICD/bento-centos-6.10-x86_64-LATEST
       ==> default:  -- Target VM: B5 Lab - Folder/vm/CICD/source-centos-6-bento-app-access-1551294901-dc
       ==> default: New virtual machine successfully cloned
       ==> default: Waiting for the machine to report its IP address...
           default: Timeout: 240 seconds
           default: IP: 10.199.251.66
       ==> default: Waiting for machine to boot. This may take a few minutes...
           default: SSH address: 10.199.251.66:22
           default: SSH username: vagrant
           default: SSH auth method: private key
           default: 
           default: Vagrant insecure key detected. Vagrant will automatically replace
           default: this with a newly generated keypair for better security.
           default: 
           default: Inserting generated public key within guest...
           default: Removing insecure key from the guest if it's present...
           default: Key inserted! Disconnecting and reconnecting using new SSH key...
       ==> default: Machine booted and ready!
       ==> default: Setting hostname...
       undefined method `[]' for nil:NilClass

What would be the best way to go about debugging this?