airbrake/airbrake — pull request #340 by grosser (2014-10-03 20:59:16+00:00)
Title: If we cannot stringify then at least rescue the dup exceptions ...

followup to https://github.com/airbrake/airbrake/pull/328

now I ran into a Rack::Session::Abstract::SessionHash with symbol keys -> kaboom again ...

@shifi @dvdplm