NoMethodError in Web#web_product

Showing /var/www/vhosts/castillodemuros.com/castillodemuros_old/app/views/web/web_product.html.erb where line #427 raised:

undefined method `id' for nil:NilClass

Extracted source (around line #427):

424: 				</select> -->
425: 
426:     			<% else %>
427:     			<%= hidden_field(:size, "id", :value => @product.product_variations.first.id) %>
428:     			
429:     			<% end %>
430:     		</div>

Rails.root: /var/www/vhosts/castillodemuros.com/castillodemuros_old

Application Trace | Framework Trace | Full Trace
app/views/web/web_product.html.erb:427:in `_app_views_web_web_product_html_erb__2275083004818594091_70155146459880'

Request

Parameters:

{"locale"=>"es",
 "id"=>"226-stop-ducati-y-otras"}

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Response

Headers:

None