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-rwxr-xr-xactionpack/lib/action_controller/base.rb3
1 files changed, 2 insertions, 1 deletions
diff --git a/actionpack/lib/action_controller/base.rb b/actionpack/lib/action_controller/base.rb
index 6ba5e141ea..cfd60ac6bf 100755
--- a/actionpack/lib/action_controller/base.rb
+++ b/actionpack/lib/action_controller/base.rb
@@ -441,7 +441,8 @@ module ActionController #:nodoc:
elsif value.is_a?(Hash)
filtered_parameters[key] = filter_parameters(value)
elsif block_given?
- key, value = key.dup, value.dup
+ key = key.dup
+ value = value.dup if value
yield key, value
filtered_parameters[key] = value
else