no mehtod upcase?

gistfile1.txt

NoMethodError in Stocks#index

Showing /home/jd/isotope/dividend_reporter/app/views/stocks/index.html.erb where line #13 raised:

undefined method `upcase' for nil:NilClass

Extracted source (around line #13):

10: 
11: <% @stocks.each do |stock| %>
12:   <tr>
13:     <td><%= link_to @quotes[stock.symbol.upcase].symbol, stock %></td>
14:     <td><%= @quotes[stock.symbol.upcase].name %></td>
15:     <td><%= @quotes[stock.symbol.upcase].lastTrade %></td>
16:     <td><%= @quotes_ext[stock.symbol.upcase].dividendPerShare %></td>

Rails.root: /home/jd/isotope/dividend_reporter
Application Trace | Framework Trace | Full Trace

app/views/stocks/index.html.erb:13:in `block in _app_views_stocks_index_html_erb__1275561124624245974_33415680_2273465482082668600'
app/views/stocks/index.html.erb:11:in `each'
app/views/stocks/index.html.erb:11:in `_app_views_stocks_index_html_erb__1275561124624245974_33415680_2273465482082668600'
app/controllers/stocks_controller.rb:9:in `index'