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@@ -1910,6 +1910,8 @@ module ActiveRecord #:nodoc:
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         #   { :name => "foo'bar", :group_id => 4 }  returns "name='foo''bar' and group_id='4'"
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         #   "name='foo''bar' and group_id='4'" returns "name='foo''bar' and group_id='4'"
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         def sanitize_sql_for_conditions(condition)
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+          return nil if condition.blank?
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+
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           case condition
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             when Array; sanitize_sql_array(condition)
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             when Hash;  sanitize_sql_hash_for_conditions(condition)

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@@ -48,6 +48,12 @@ class HasManyAssociationsTest < ActiveRecord::TestCase
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     assert_equal 2, Firm.find(:first).clients.length
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   end
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+  def test_find_with_blank_conditions
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+    [[], {}, nil, ""].each do |blank|
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+      assert_equal 2, Firm.find(:first).clients.find(:all, :conditions => blank).size
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+    end
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+  end
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+
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   def test_find_many_with_merged_options
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     assert_equal 1, companies(:first_firm).limited_clients.size
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     assert_equal 1, companies(:first_firm).limited_clients.find(:all).size
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@@ -851,4 +857,4 @@ class HasManyAssociationsTest < ActiveRecord::TestCase
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     assert ! firm.clients.include?(client)
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   end
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-end
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\ No newline at end of file
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+end