ruby-2.2.2/gems/puma-2.11.3/lib/puma/cluster.rb:180:in wakeup!': undefined method closed?' for nil:NilClass (NoMethodError)

[mikeki]

Using foreman start puma dies. This is the stack trace:

from /.rvm/gems/ruby-2.2.2/gems/puma-2.11.3/lib/puma/cluster.rb:261:in `stop'
from /.rvm/gems/ruby-2.2.2/gems/puma-2.11.3/lib/puma/cli.rb:234:in `stop'
from /.rvm/gems/ruby-2.2.2/gems/puma-2.11.3/lib/puma/cli.rb:501:in `block in setup_signals'
from /.rvm/gems/ruby-2.2.2/gems/activerecord-4.2.2/lib/active_record/base.rb:4:in `call'
from /.rvm/gems/ruby-2.2.2/gems/activerecord-4.2.2/lib/active_record/base.rb:4:in `require'
from /.rvm/gems/ruby-2.2.2/gems/activerecord-4.2.2/lib/active_record/base.rb:4:in `<top (required)>'
from /.rvm/gems/ruby-2.2.2/gems/unread-0.6.1/lib/unread/read_mark.rb:1:in `<top (required)>'
from /.rvm/gems/ruby-2.2.2/gems/unread-0.6.1/lib/unread.rb:2:in `require'
from /.rvm/gems/ruby-2.2.2/gems/unread-0.6.1/lib/unread.rb:2:in `<top (required)>'
from /.rvm/gems/ruby-2.2.2/gems/bundler-1.9.9/lib/bundler/runtime.rb:76:in `require'
from /.rvm/gems/ruby-2.2.2/gems/bundler-1.9.9/lib/bundler/runtime.rb:76:in `block (2 levels) in require'
from /.rvm/gems/ruby-2.2.2/gems/bundler-1.9.9/lib/bundler/runtime.rb:72:in `each'
from /.rvm/gems/ruby-2.2.2/gems/bundler-1.9.9/lib/bundler/runtime.rb:72:in `block in require'
from /.rvm/gems/ruby-2.2.2/gems/bundler-1.9.9/lib/bundler/runtime.rb:61:in `each'
from /.rvm/gems/ruby-2.2.2/gems/bundler-1.9.9/lib/bundler/runtime.rb:61:in `require'
from /.rvm/gems/ruby-2.2.2/gems/bundler-1.9.9/lib/bundler.rb:134:in `require'
from /workspace/frangear/config/application.rb:7:in `<top (required)>'
from /workspace/frangear/config/environment.rb:2:in `require'
from /workspace/frangear/config/environment.rb:2:in `<top (required)>'
from config.ru:3:in `require'
from config.ru:3:in `block in <main>'
from /.rvm/gems/ruby-2.2.2/gems/rack-1.6.4/lib/rack/builder.rb:55:in `instance_eval'
from /.rvm/gems/ruby-2.2.2/gems/rack-1.6.4/lib/rack/builder.rb:55:in `initialize'
from config.ru:in `new'
from config.ru:in `<main>'
from /.rvm/gems/ruby-2.2.2/gems/rack-1.6.4/lib/rack/builder.rb:49:in `eval'
from /.rvm/gems/ruby-2.2.2/gems/rack-1.6.4/lib/rack/builder.rb:49:in `new_from_string'
from /.rvm/gems/ruby-2.2.2/gems/rack-1.6.4/lib/rack/builder.rb:40:in `parse_file'
from /.rvm/gems/ruby-2.2.2/gems/puma-2.11.3/lib/puma/configuration.rb:102:in `load_rackup'
from /.rvm/gems/ruby-2.2.2/gems/puma-2.11.3/lib/puma/configuration.rb:69:in `app'
from /.rvm/gems/ruby-2.2.2/gems/puma-2.11.3/lib/puma/runner.rb:113:in `load_and_bind'
from /.rvm/gems/ruby-2.2.2/gems/puma-2.11.3/lib/puma/cluster.rb:302:in `run'
from /.rvm/gems/ruby-2.2.2/gems/puma-2.11.3/lib/puma/cli.rb:216:in `run'
from /.rvm/gems/ruby-2.2.2/gems/puma-2.11.3/bin/puma:10:in `<top (required)>'
from /.rvm/gems/ruby-2.2.2/bin/puma:23:in `load'
from /.rvm/gems/ruby-2.2.2/bin/puma:23:in `<main>'
from /.rvm/gems/ruby-2.2.2/bin/ruby_executable_hooks:15:in `eval'
from /.rvm/gems/ruby-2.2.2/bin/ruby_executable_hooks:15:in `<main>'