TypeError: /var/www/evers-pr.com/templates/artist.pug:27
   25| });
   26|
 > 27| - var artistname = artist.firstname + " " + artist.lastname
   28|
   29| title EVERS PR – #{artistname}
   30| meta(name="title" content="EVERS PR Agentur - Klient " +artistname)

Cannot read properties of null (reading 'firstname')
   at eval (eval at wrap (/var/www/evers-pr.com/node_modules/pug-runtime/wrap.js:6:10), <anonymous>:165:25)
   at template (eval at wrap (/var/www/evers-pr.com/node_modules/pug-runtime/wrap.js:6:10), <anonymous>:572:7)
   at exports.renderFile (/var/www/evers-pr.com/node_modules/pug/lib/index.js:454:38)
   at exports.renderFile (/var/www/evers-pr.com/node_modules/pug/lib/index.js:444:21)
   at exports.__express [as engine] (/var/www/evers-pr.com/node_modules/pug/lib/index.js:493:11)
   at View.render (/var/www/evers-pr.com/node_modules/express/lib/view.js:135:8)
   at tryRender (/var/www/evers-pr.com/node_modules/express/lib/application.js:657:10)
   at Function.render (/var/www/evers-pr.com/node_modules/express/lib/application.js:609:3)
   at ServerResponse.render (/var/www/evers-pr.com/node_modules/express/lib/response.js:1057:7)
   at /var/www/evers-pr.com/controllers/view.controller.js:319:9
   at /var/www/evers-pr.com/node_modules/async/dist/async.js:3891:9
   at /var/www/evers-pr.com/node_modules/async/dist/async.js:473:16
   at iteratorCallback (/var/www/evers-pr.com/node_modules/async/dist/async.js:1067:13)
   at /var/www/evers-pr.com/node_modules/async/dist/async.js:972:16
   at /var/www/evers-pr.com/node_modules/async/dist/async.js:3888:13
   at /var/www/evers-pr.com/controllers/view.controller.js:314:16