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-rw-r--r--actionpack/lib/action_dispatch/http/parameter_filter.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/actionpack/lib/action_dispatch/http/parameter_filter.rb b/actionpack/lib/action_dispatch/http/parameter_filter.rb
index b655a54865..df4b073a17 100644
--- a/actionpack/lib/action_dispatch/http/parameter_filter.rb
+++ b/actionpack/lib/action_dispatch/http/parameter_filter.rb
@@ -56,7 +56,7 @@ module ActionDispatch
elsif value.is_a?(Array)
value = value.map { |v| v.is_a?(Hash) ? call(v) : v }
elsif blocks.any?
- key = key.dup
+ key = key.dup if key.duplicable?
value = value.dup if value.duplicable?
blocks.each { |b| b.call(key, value) }
end