Index: vendor/plugins/awesome_nested_set/lib/awesome_nested_set.rb
===================================================================
--- vendor/plugins/awesome_nested_set/lib/awesome_nested_set.rb    (revision 9607)
+++ vendor/plugins/awesome_nested_set/lib/awesome_nested_set.rb    (working copy)
@@ -184,7 +184,7 @@
             find(:all, :conditions => ["#{quoted_parent_column_name} = ? #{scope.call(node)}", node], :order => "#{quoted_left_column_name}, #{quoted_right_column_name}, #{acts_as_nested_set_options[:order]}").each{|n| set_left_and_rights.call(n) }
             # set right
             node[right_column_name] = indices[scope.call(node)] += 1    
-            node.save!    
+            node.save(false)
           end

           # Find root node(s)