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@@ -115,7 +115,8 @@ module ActsAsUrlParam
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       def set_url_param
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         if url_param.blank? or acts_as_url_options[:on] != :create
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-          write_attribute(acts_as_url_options[:column], compute_url_param)
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+          url = compute_url_param
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+          write_attribute(acts_as_url_options[:column], url) unless url.blank?
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         end
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         @url_param_validated = true
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       end

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@@ -87,6 +87,13 @@ class ActsAsUrlParamTest < Test::Unit::TestCase
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     author.update_attributes(:bio => 'unrelated to url param')
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     assert_equal(author_url, author.to_param)
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   end
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+  
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+  def test_should_not_set_existing_url_name_to_blank
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+    author = ActsAsUrlParam::Author.create(:label => 'name of author')
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+    author_url = author.to_param
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+    author.update_attributes(:label => '')
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+    assert_equal(author_url, author.to_param)
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+  end
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   def test_should_not_update_url_name_by_default
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     item = ActsAsUrlParam::Item.create(:name => 'this is a url param')

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@@ -1,3 +1,3 @@
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 class ActsAsUrlParam::Author < ActsAsUrlParamBase
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-  acts_as_url_param :on => :update
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+  acts_as_url_param :on => :update, :allow_blank => true
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 end
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