diff --git a/activerecord/lib/active_record/base.rb b/activerecord/lib/active_record/base.rb
index 60fd995..22a801a 100755
--- a/activerecord/lib/active_record/base.rb
+++ b/activerecord/lib/active_record/base.rb
@@ -2680,11 +2680,18 @@ module ActiveRecord #:nodoc:
 
           unless value.empty?
             attributes[attribute_name] <<
-              [ find_parameter_position(multiparameter_name), type_cast_attribute_value(multiparameter_name, value) ]
+              [ find_parameter_position(multiparameter_name).to_i, type_cast_attribute_value(multiparameter_name, value) ]
           end
         end
 
-        attributes.each { |name, values| attributes[name] = values.sort_by{ |v| v.first }.collect { |v| v.last } }
+        attributes.each do |name, values|
+          values = values.sort_by{ |v| v.first }
+          attributes[name] = if values.empty? || values.last.first > values.size
+            []
+          else
+            values.collect { |v| v.last }
+          end
+        end
       end
 
       def type_cast_attribute_value(multiparameter_name, value)
diff --git a/activerecord/test/cases/base_test.rb b/activerecord/test/cases/base_test.rb
index 8725c76..3caa82f 100755
--- a/activerecord/test/cases/base_test.rb
+++ b/activerecord/test/cases/base_test.rb
@@ -971,6 +971,13 @@ class BasicsTest < ActiveRecord::TestCase
     assert_date_from_db Date.new(2004, 6, 1), topic.last_read.to_date
   end
 
+  def test_multiparameter_attributes_on_date_with_empty_year
+    attributes = { "last_read(1i)" => "", "last_read(2i)" => "6", "last_read(3i)" => "1" }
+    topic = Topic.find(1)
+    topic.attributes = attributes
+    assert_nil topic.last_read
+  end
+
   def test_multiparameter_attributes_on_date_with_all_empty
     attributes = { "last_read(1i)" => "", "last_read(2i)" => "", "last_read(3i)" => "" }
     topic = Topic.find(1)