NoMethodError in Web#web_product

Showing /var/www/vhosts/trendclic.de/trendclicdetk/app/views/web/web_product.html.erb where line #608 raised:

undefined method `stock_ext' for nil:NilClass

Extracted source (around line #608):

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<% end %>
<% if @product.stock_ext.present? && @product.stock_ext == true %>
<div id="tiempo_envio">
<% if @product.sizes.where("stock > ?", 0).order(:position).first.stock_ext > 0 %>
<%if @product.brand.stock_ext_message.present? %>
<div class="texto-almacen-exterior-producto " style="color:red;"><%= @product.brand.stock_ext_message %></div>
<%else%>

Rails.root: /var/www/vhosts/trendclic.de/trendclicdetk

Application Trace | Framework Trace | Full Trace
app/views/web/web_product.html.erb:608:in `_app_views_web_web_product_html_erb___4277389985231287864_47290831663400'

Request

Parameters:

{"id"=>"1663-shoe-dr-martens-1461-smooth-cherry"}

Response

Headers:

None