lib/cucumber/formatter/json.rb in cucumber-5.1.3 vs lib/cucumber/formatter/json.rb in cucumber-5.2.0

@@ -20,10 +20,10 @@
           "Please use --format=message and stand-alone json-formatter.\n" \
           'json-formatter homepage: https://github.com/cucumber/cucumber/tree/master/json-formatter#cucumber-json-formatter',
           '6.0.0'
         )
 
-        @io = ensure_io(config.out_stream)
+        @io = ensure_io(config.out_stream, config.error_stream)
         @ast_lookup = AstLookup.new(config)
         @feature_hashes = []
         @step_or_hook_hash = {}
         config.on_event :test_case_started, &method(:on_test_case_started)
         config.on_event :test_case_finished, &method(:on_test_case_finished)