workflow.rb in eco-helpers-2.0.3

- old
+ new

@@ -193,9 +193,10 @@
           # @yieldparam stage_workflow [Eco::API::Session::Config::Workflow] the _target stage_ referred by `key`
           # @yieldparam io [Eco::API::UseCases::BaseIO] the input/output object carried througout all the _workflow_
           # @yieldreturn [Eco::API::UseCases::BaseIO] the `io` input/output object carried througout all the _workflow_
           # @return [Eco::API::Session::Config::Workflow] the current stage object (to ease chainig).
           def run(key = nil, io:, &block)
+            raise "Missing BaseIO object" unless io.is_a?(Eco::API::UseCases::BaseIO)
             begin
               if key
                 io = stage(key).run(io: io, &block)
               elsif pending?
                 @before.each {|c| io = c.call(self, io)}