undefined method '<<' for nil:NilClass

It does not seem to be working with Sinatra 1.3.2

When just requiring rack-flash it throws this error:

ERROR NoMethodError: undefined method `<<' for nil:NilClass
    /Users/david/.rvm/gems/ruby-1.9.3-p0/gems/rack-flash-0.1.2/lib/rack/flash.rb:11:in `use'
    /Users/david/.rvm/gems/ruby-1.9.3-p0/gems/sinatra-1.3.2/lib/sinatra/base.rb:1339:in `setup_default_middleware'
    /Users/david/.rvm/gems/ruby-1.9.3-p0/gems/sinatra-1.3.2/lib/sinatra/base.rb:1327:in `build'
    /Users/david/.rvm/gems/ruby-1.9.3-p0/gems/sinatra-1.3.2/lib/sinatra/base.rb:1321:in `new'
    /Users/david/.rvm/gems/ruby-1.9.3-p0/gems/sinatra-1.3.2/lib/sinatra/base.rb:1311:in `prototype'
    /Users/david/.rvm/gems/ruby-1.9.3-p0/gems/sinatra-1.3.2/lib/sinatra/base.rb:1334:in `block in call'
    /Users/david/.rvm/gems/ruby-1.9.3-p0/gems/sinatra-1.3.2/lib/sinatra/base.rb:1416:in `synchronize'
    /Users/david/.rvm/gems/ruby-1.9.3-p0/gems/sinatra-1.3.2/lib/sinatra/base.rb:1334:in `call'
    /Users/david/.rvm/gems/ruby-1.9.3-p0/gems/rack-1.4.0/lib/rack/handler/webrick.rb:59:in `service'
    /Users/david/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service'
    /Users/david/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run'
    /Users/david/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'

[carsonbaker]

Also happening to me.

[daz-codes]

I'm getting this too

[tonkla]

It works with Sinatra 1.3.2, but you must downgrade Rack to v1.3.6.

[ptinsley]

throwing a "me too" on this, the workaround @tonkla posted works for me, rack was on 1.4.0, went down to 1.3.6 and the error goes away.

So, is this a Rack-flash issue, or a Rack issue?

[tonkla]

Rack 1.4.0 was changed the infrastructure, so Rack-flash will follow that steps.

[julik]

Also confirmed here

[thekeith]

Confirmed this as an issue on my end as well. This is occurring on Heroku with the bamboo-mri-1.9.2 stack. Text of error:

!! Unexpected error while processing request: undefined method `<<' for nil:NilClass

[CloudMarc]

Confirmed with these:
Using bundler (1.0.21)
Using rack (1.3.5)
Using rack-flash (0.1.2)
Using sinatra (1.3.1)
ruby 1.9.3p0

[atotic]

Pretty funny, I just ran into this yesterday :)

Aleks

On Fri, Jan 20, 2012 at 12:23 PM, Marc Byrd
reply@reply.github.com
wrote:

Confirmed with these:
 Using bundler (1.0.21)
 Using rack (1.3.5)
 Using rack-flash (0.1.2)
 Using sinatra (1.3.1)
 ruby 1.9.3p0

---

Reply to this email directly or view it on GitHub:
#8 (comment)

Same here, any workaround in the meantime?

[4poc]

I've the same problem, downgrading rack to 1.3.6 in the meantime, Gemfile:
gem "rack", "<= 1.3.6"

Using rack (1.3.6) 
Using rack-flash (0.1.2) 
Using sinatra (1.3.2) 

[jessor]

alternative: sinatra-flash

[codykrieger]

Yeah, that's what I've moved to at this point.

[chy-causer]

I've had a look and it seems to be caused by some dead code. Removing it seemed to fix it for me, and I'm not sure what it was ever supposed to do because it was monkey patching Rack::Builder!!

https://github.com/ChrisCauser/rack-flash

The tests don't run because it requires Sinatra < 1.0 (again, !!!!) Once I've had a look at the tests I'll put in a pull request, but in the meantime folks, take a look at the fork linked above.