Rails - Jul 2006 - Something wrong with the div

<div id="side">

     <div id= "cart"
line 16----> 	<% if @cart.items.empty? %>
 	style="display: none"
 <% end %>

<%= hidden_div_if(@cart.items.empty?, :id => "cart") %>

Whenever i press on checkout it says....You have a nil object when you 
didn''t expect it!
The error occured while evaluating nil.items,

Extracted source (around line #16):

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