Rails - Sep 2008 - Redirect Loop

I have the following code in my controller:

  def list_by_so_number
    if request.get?
    	@histories = History.find(:all, :conditions => [''so_number =
?'',
params[:sales_order_number]], :order => ''timestamp desc'')
    	if @histories.length < 1 then
        	flash[:notice] = ''There isn\''t a Sales Order that
matches the
number you entered''
        	redirect_to :action => ''list_by_so_number''
      	end
	end
  end

My problem is that when I purposely enter a bogus so_number, I wind up
in a redirect loop, because of the redirect_to :action =>
''list_by_so_number'' line.

How can I rewrite this so that when no histories are found, it''ll
redirect to the list_by_so_number action, and notify the user?

Thanks,

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