NameError (undefined local variable or method `env' when calling ld_client.variation

[everly-blake]

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Describe the bug
On rails 5.1.6, I am initializing ld_client per the docs on_worker_boot in my puma config. However, whenever I run code that checks ld_client.variation my application throws the above exception, presumably something in the middleware. From my testing, this only happens if ld_client isn't properly instantiated. However, I cannot get ld_client to properly initialize during startup now. This used to only happen occasionally, but now I can't get it to start at all.

To reproduce
Rails 5.1.6 using puma

on_worker_boot do ActiveRecord::Base.establish_connection Rails.configuration.ld_client = LaunchDarkly::LDClient.new(ENV['LAUNCH_DARKLY_SDK_KEY']) end

Simple check somewhere in controller: Rails.configuration.ld_client.variation('synchronous_checkout', current_user, false)

And I get the error every time now.

Expected behavior
true or false returned for that toggle, based on environment/project specific launch darkly settings.

Logs
If applicable, add any log output related to your problem.

SDK version
The version of this SDK that you are using.

Language version, developer tools
ruby 2.5.7
rails 5.1.6
launchdarkly-server-sdk (5.8.0)

OS/platform
OSX Mojave 10.14.1

Additional context
Within a console, if I manually run the initialization code it works, so I don't know if this is something puma specific or what.