diff --git a/actionpack/lib/action_controller/base.rb b/actionpack/lib/action_controller/base.rb
index 1d8cc14afe549..d66e66622854c 100644
--- a/actionpack/lib/action_controller/base.rb
+++ b/actionpack/lib/action_controller/base.rb
@@ -502,7 +502,7 @@ def filter_parameter_logging(*filter_words, &block)
               end
             elsif block_given?
               key = key.dup
-              value = value.dup if value
+              value = value.dup if value.duplicable?
               yield key, value
               filtered_parameters[key] = value
             else
diff --git a/actionpack/test/controller/filter_params_test.rb b/actionpack/test/controller/filter_params_test.rb
index 6994aaed5b7e1..670edc15113e7 100644
--- a/actionpack/test/controller/filter_params_test.rb
+++ b/actionpack/test/controller/filter_params_test.rb
@@ -18,6 +18,7 @@ def test_filter_parameters
     test_hashes = [[{},{},[]],
     [{'foo'=>nil},{'foo'=>nil},[]],
     [{'foo'=>'bar'},{'foo'=>'bar'},[]],
+    [{'foo'=>1},{'foo'=>1},[]],
     [{'foo'=>'bar'},{'foo'=>'bar'},%w'food'],
     [{'foo'=>'bar'},{'foo'=>'[FILTERED]'},%w'foo'],
     [{'foo'=>'bar', 'bar'=>'foo'},{'foo'=>'[FILTERED]', 'bar'=>'foo'},%w'foo baz'],