[Satellite 6.x] - When using the puppetlabs-ntp module, the puppet agent command fails with the error "Error 400 on SERVER: true is not an Array"

Issue

• When using the puppetlabs-ntp module, the puppet agent command fails with the error "Error 400 on SERVER: true is not an Array"

# puppet agent -tv 
[...SNIP...]
Error: Could not retrieve catalog from remote server: Error 400 on SERVER: true is not an Array.  
It looks to be a TrueClass at /etc/puppet/environments/KT_my_test_env/modules/ntp/manifests/init.pp:46 on node host1.examplel.com
Warning: Not using cache on failed catalog
Error: Could not retrieve catalog; skipping run