Spring stopping Rails console from running

Question

I recently upgraded my Ruby to 2.5.0. Since then, I haven't been able to run the Rails Console properly. It either hangs indefinitely, or, after a few seconds, shows me this error:

before_session hook failed: NoMethodError: undefined method `reject!' for nil:NilClass

Full error:

Running via Spring preloader in process 6102
Loading development environment (Rails 5.1.4)
before_session hook failed: NoMethodError: undefined method `reject!' for nil:NilClass
Traceback (most recent call last):
/Users/zoro/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/spring-2.0.2/lib/spring/application.rb:171:in `fork': undefined method `reject!' for nil:NilClass (NoMethodError)

If I DISABLE_SPRING, I'm able to start up my console as expected. However, (Not sure if this is related, if it's not- I can figure this out separately) if any errors occur, the console "crashes" and kicks me back to the terminal:

⇒rails console
Loading development environment (Rails 5.1.4)
[1] pry(main)> a
Traceback (most recent call last):
bin/rails: undefined method `[]' for nil:NilClass (NoMethodError)
⇒

Any help on this would be greatly appreciated. Using rbenv to manage Rubies, and not having this error on other versions of Ruby.

Answer 1

This appears to be some strange issue with the binding_of_caller in conjunction with Spring. Removing that gem got things back working as expected. I knew I'd find the answer as soon as I asked.

There isn't currently a fix, but it does seem to have an open issue already: https://github.com/charliesome/better_errors/issues/411