SSHKit 1.9.0 might fail with the following error, when trying to deploy a Rail application. Upgrading the gem to version 1.21.0 fixed the issue.

Traceback (most recent call last):
	17: from /home/user/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/sshkit-1.9.0/lib/sshkit/runners/parallel.rb:12:in `block (2 levels) in execute'
	16: from /home/user/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/sshkit-1.9.0/lib/sshkit/backends/abstract.rb:29:in `run'
	15: from /home/user/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/sshkit-1.9.0/lib/sshkit/backends/abstract.rb:29:in `instance_exec'
	14: from /home/user/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/capistrano-3.14.1/lib/capistrano/tasks/deploy.rake:89:in `block (4 levels) in <top (required)>'
	13: from /home/user/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/capistrano-3.14.1/lib/capistrano/tasks/deploy.rake:89:in `each'
	12: from /home/user/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/capistrano-3.14.1/lib/capistrano/tasks/deploy.rake:90:in `block (5 levels) in <top (required)>'
	11: from /home/user/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/sshkit-1.9.0/lib/sshkit/backends/abstract.rb:50:in `test'
	10: from /home/user/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/sshkit-1.9.0/lib/sshkit/backends/abstract.rb:137:in `create_command_and_execute'
	 9: from /home/user/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/sshkit-1.9.0/lib/sshkit/backends/abstract.rb:137:in `tap'
	 8: from /home/user/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/sshkit-1.9.0/lib/sshkit/backends/abstract.rb:137:in `block in create_command_and_execute'
	 7: from /home/user/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/sshkit-1.9.0/lib/sshkit/backends/netssh.rb:84:in `execute_command'
	 6: from /home/user/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/airbrussh-1.4.0/lib/airbrussh/delegating_formatter.rb:25:in `block (2 levels) in <class:DelegatingFormatter>'
	 5: from /home/user/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/airbrussh-1.4.0/lib/airbrussh/delegating_formatter.rb:25:in `map'
	 4: from /home/user/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/airbrussh-1.4.0/lib/airbrussh/delegating_formatter.rb:25:in `block (3 levels) in <class:DelegatingFormatter>'
	 3: from /home/user/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/airbrussh-1.4.0/lib/airbrussh/delegating_formatter.rb:25:in `public_send'
	 2: from /home/user/.rbenv/versions/2.5.0/lib/ruby/2.5.0/delegate.rb:83:in `method_missing'
	 1: from /home/user/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/sshkit-1.9.0/lib/sshkit/formatters/pretty.rb:21:in `log_command_start'
/home/user/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/sshkit-1.9.0/lib/sshkit/formatters/pretty.rb:53:in `write_message': undefined method `>=' for nil:NilClass (NoMethodError)

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