[typo] any idea of this exception?

[Piero Campanelli]

NoMethodError (undefined method `<=' for nil:NilClass):
    /vendor/plugins/expiring_action_cache/lib/actionparamcache.rb:84:in `before'
    /vendor/rails/actionpack/lib/action_controller/filters.rb:242:in
`prepend_around_filter'
    /vendor/rails/actionpack/lib/action_controller/filters.rb:401:in
`call_filters'
    /vendor/rails/actionpack/lib/action_controller/filters.rb:394:in
`call_filters'
    /vendor/rails/actionpack/lib/action_controller/filters.rb:383:in
`before_action'
    /vendor/rails/actionpack/lib/action_controller/filters.rb:365:in
`perform_action_without_benchmark'
    /vendor/rails/actionpack/lib/action_controller/benchmarking.rb:69:in
`perform_action_without_rescue'
    /home/pierocampanelli/extra/lib/ruby/1.8/benchmark.rb:293:in `measure'
    /vendor/rails/actionpack/lib/action_controller/benchmarking.rb:69:in
`perform_action_without_rescue'
    /vendor/rails/actionpack/lib/action_controller/rescue.rb:82:in
`perform_action'
    /vendor/rails/actionpack/lib/action_controller/base.rb:408:in
`process_without_filters'
    /vendor/rails/actionpack/lib/action_controller/filters.rb:377:in
`process_without_session_management_support'
    /vendor/rails/actionpack/lib/action_controller/session_management.rb:117:in
`process'
    /vendor/rails/railties/lib/dispatcher.rb:38:in `dispatch'
    /vendor/rails/railties/lib/fcgi_handler.rb:150:in `process_request'
    /vendor/rails/railties/lib/fcgi_handler.rb:54:in `process!'
    /home/pierocampanelli/extra/lib/ruby/site_ruby/1.8/fcgi.rb:600:in `each_cgi'
    /home/pierocampanelli/extra/lib/ruby/site_ruby/1.8/fcgi.rb:597:in `each_cgi'
    /vendor/rails/railties/lib/fcgi_handler.rb:53:in `process!'
    /vendor/rails/railties/lib/fcgi_handler.rb:23:in `process!'
    dispatch.fcgi:34
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