An ActionView::Template::Error occurred in stickers#buy

An ActionView::Template::Error occurred in stickers#buy:

 undefined method `gsub' for nil:NilClass
 app/helpers/stickers_helper.rb:7:in `show_address'


-------------------------------
Request:
-------------------------------

 * URL        : https://www.bikelink.org/stickers/buy
 * HTTP Method: GET
 * IP address : 98.35.154.160
 * Parameters : {"controller"=>"stickers", "action"=>"buy"}
 * Timestamp  : 2021-06-22 20:46:42 UTC
 * Server : www-4.internal.bikelink.org
   * Rails root : /var/www/bikelink
 * Process: 25450

-------------------------------
Session:
-------------------------------

 * session id: [FILTERED]
 * data: {"session_id"=>"727740c0a1800c348cbd2e2656529f62",
  "_csrf_token"=>"d1kLZ4pE6unXEK5aYvt/zNEU5stggZptrvvchviY3Lk=",
  "warden.user.person.key"=>[[48829], "4zygCVuQi3tLR-5xrJzk"]}

-------------------------------
Backtrace:
-------------------------------

 app/helpers/stickers_helper.rb:7:in `show_address'
 app/views/stickers/buy.html.erb:13
 app/views/stickers/buy.html.erb:1
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