Ansible provisioner fails for VirtualBox provider. Undefined method `end_with?' for nil:NilClass #5837
Description
On Vagrant 1.7.2 I get the following error when running Ansible provisioner for one of my machines:
/opt/vagrant/embedded/gems/gems/vagrant-1.7.2/plugins/provisioners/ansible/provisioner.rb:137:in `block (2 levels) in setup_inventory_file': undefined method `end_with?' for nil:NilClass (NoMethodError)
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/plugins/provisioners/ansible/provisioner.rb:132:in `each_pair'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/plugins/provisioners/ansible/provisioner.rb:132:in `block in setup_inventory_file'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/plugins/provisioners/ansible/provisioner.rb:105:in `open'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/plugins/provisioners/ansible/provisioner.rb:105:in `open'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/plugins/provisioners/ansible/provisioner.rb:105:in `setup_inventory_file'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/plugins/provisioners/ansible/provisioner.rb:34:in `provision'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/builtin/provision.rb:133:in `run_provisioner'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:95:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:95:in `block in finalize_action'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/builder.rb:116:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/runner.rb:66:in `block in run'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/util/busy.rb:19:in `busy'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/runner.rb:66:in `run'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/environment.rb:428:in `hook'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/builtin/provision.rb:121:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/builtin/provision.rb:121:in `block in call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/builtin/provision.rb:103:in `each'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/builtin/provision.rb:103:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /Users/lukaszk/.vagrant.d/gems/gems/vagrant-cachier-1.2.0/lib/vagrant-cachier/action/configure_bucket_root.rb:20:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/plugins/providers/virtualbox/action/clear_forwarded_ports.rb:15:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/plugins/providers/virtualbox/action/set_name.rb:50:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/plugins/providers/virtualbox/action/clean_machine_folder.rb:17:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/plugins/providers/virtualbox/action/check_accessible.rb:18:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:95:in `block in finalize_action'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/builder.rb:116:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/runner.rb:66:in `block in run'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/util/busy.rb:19:in `busy'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/runner.rb:66:in `run'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/builtin/call.rb:53:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:95:in `block in finalize_action'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/builder.rb:116:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/runner.rb:66:in `block in run'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/util/busy.rb:19:in `busy'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/runner.rb:66:in `run'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/builtin/call.rb:53:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:95:in `block in finalize_action'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/builder.rb:116:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/runner.rb:66:in `block in run'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/util/busy.rb:19:in `busy'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/runner.rb:66:in `run'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/builtin/call.rb:53:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/builtin/box_check_outdated.rb:36:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/builtin/config_validate.rb:25:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/plugins/providers/virtualbox/action/check_virtualbox.rb:17:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:95:in `block in finalize_action'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/plugins/providers/virtualbox/action/match_mac_address.rb:16:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/plugins/providers/virtualbox/action/import.rb:32:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/plugins/providers/virtualbox/action/customize.rb:40:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/plugins/providers/virtualbox/action/check_accessible.rb:18:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:95:in `block in finalize_action'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/builder.rb:116:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/runner.rb:66:in `block in run'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/util/busy.rb:19:in `busy'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/runner.rb:66:in `run'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/builtin/call.rb:53:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/builtin/config_validate.rb:25:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:95:in `block in finalize_action'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/builtin/handle_box.rb:56:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:95:in `block in finalize_action'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/builder.rb:116:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/runner.rb:66:in `block in run'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/util/busy.rb:19:in `busy'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/runner.rb:66:in `run'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/builtin/call.rb:53:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/plugins/providers/virtualbox/action/check_virtualbox.rb:17:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/builder.rb:116:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/runner.rb:66:in `block in run'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/util/busy.rb:19:in `busy'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/action/runner.rb:66:in `run'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/machine.rb:214:in `action_raw'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/machine.rb:191:in `block in action'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/environment.rb:516:in `lock'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/machine.rb:178:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/machine.rb:178:in `action'
from /opt/vagrant/embedded/gems/gems/vagrant-1.7.2/lib/vagrant/batch_action.rb:82:in `block (2 levels) in run'