NoMethodError in Web#web_product

Showing /var/www/vhosts/lolitamoda.pt/lolitapt/app/views/web/web_product.html.erb where line #776 raised:

undefined method `image_url' for nil:NilClass

Extracted source (around line #776):

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<a href='<%= "http://twitter.com/share?text=#{@product.name}&url="+request.original_url+"#{web_product_path(:id => @product.id)}" %>' id="ico-twitter"><%= image_tag("/assets/github/twitter.svg", :id=>"icono-twitter", :style => "width: 40px; height: 40px; margin-right: 5px; border-radius: 5px;") %></a>
<a href='<%= "http://pinterest.com/pin/create/button/?url="+request.original_url+"#{web_product_path(:id => @product.id)}&description=#{@product.description}&media=http://velfix.com#{@p_photo.image_url(:thumb)}" %>' id="ico-pinterest"><%= image_tag("/assets/github/pinterest.svg", :id=>"icono-pinterest", :style => "width: 40px; height: 40px; margin-right: 5px; border-radius: 5px;") %></a>
</div>
</div>

Rails.root: /var/www/vhosts/lolitamoda.pt/lolitapt

Application Trace | Framework Trace | Full Trace
app/views/web/web_product.html.erb:776:in `_app_views_web_web_product_html_erb___2502609449497505400_46962186546560'

Request

Parameters:

{"id"=>"9301-t-shirt-gorgeous-macaco-branco-homem"}

Response

Headers:

None