[Rails] bundler/capistrano deployment - Rails3 / bundler 1.0.15

deploying an app with bundler/capistrano recipe, I get the following
warnings

WARNING: abstract-1.0.0 has an invalid nil value for @cert_chain
WARNING: builder-2.1.2 has an invalid nil value for @cert_chain
WARNING: rubyntlm-0.1.1 has an invalid nil value for @cert_chain
WARNING: ya2yaml-0.30 has an invalid nil value for @cert_chain

@cert_chain; what does it means ? is it important ?

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