We have random fail of deploy with error in astute Error running RPC method task_deploy: undefined method `keys' for nil:NilClass

[Tatyanka]

We have random fail of deployment on different deployment configuration and different tests with error in astute:
2016-03-01 08:41:38 INFO [26158] Deployment summary: time was spent 00:00:00
2016-03-01 08:41:38 ERROR [26158] Error running RPC method task_deploy: undefined method `keys' for nil:NilClass, trace:
["/usr/share/gems/gems/astute-9.0.0/lib/astute/orchestrator.rb:71:in `task_deploy'",
 "/usr/share/gems/gems/astute-9.0.0/lib/astute/server/dispatcher.rb:113:in `task_deploy'",
 "/usr/share/gems/gems/astute-9.0.0/lib/astute/server/server.rb:187:in `dispatch_message'",
 "/usr/share/gems/gems/astute-9.0.0/lib/astute/server/server.rb:146:in `block in dispatch'",
 "/usr/share/gems/gems/astute-9.0.0/lib/astute/server/task_queue.rb:64:in `call'",
 "/usr/share/gems/gems/astute-9.0.0/lib/astute/server/task_queue.rb:64:in `block in each'",
 "/usr/share/gems/gems/astute-9.0.0/lib/astute/server/task_queue.rb:56:in `each'",
 "/usr/share/gems/gems/astute-9.0.0/lib/astute/server/task_queue.rb:56:in `each'",
 "/usr/share/gems/gems/astute-9.0.0/lib/astute/server/server.rb:144:in `each_with_index'",
 "/usr/share/gems/gems/astute-9.0.0/lib/astute/server/server.rb:144:in `dispatch'",
 "/usr/share/gems/gems/astute-9.0.0/lib/astute/server/server.rb:121:in `block in perform_main_job'"]

2016-03-01 08:41:38 INFO [26158] Casting message to Nailgun:
{"method"=>"deploy_resp",
 "args"=>
  {"task_uuid"=>"6d5498a5-4230-4752-816d-477f85d8b0fd",
   "status"=>"error",
   "error"=>
    "Method task_deploy. undefined method `keys' for nil:NilClass.\nInspect Astute logs for the details"}}
Steps:
Note there is no steps to reproduce defined but most of them looks like:

1. Create any environment
2. Deploy cluster

Actual result:
After provisioning task finishes astute fail with trace mentioned above.

This fail start to happens from mitaka-48 iso

[Bug Checker Bot (bug-checker)]

(This check performed automatically)
Please, make sure that bug description contains the following sections filled in with the appropriate data related to the bug you are describing:

expected result

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[Tatyanka (tatyana-leontovich)]

Do not see such fails more then 2 weeks, so move to incomplete

[Dmitry Pyzhov (dpyzhov)]

No failures for more than a month. Moving to Invalid. Please reopen if you see an new failure of this kind.