TypeError: /home/sur/surapp/views/articulo.ejs:8
   6| <meta property="og:type" content="article" />
   7|    <meta property="og:url" content="/articulo/<%= data.publ.slug %>" />
>> 8|    <meta property="og:title" content="<%= data.publ.titulo %> - Sur+ <%= data.publ.categoria.titulo %>" />
   9|    <%
   10|    if (data.publ.portada == undefined)
   11|     {%>

Cannot read property 'titulo' of undefined
   at eval (eval at compile (/home/sur/surapp/node_modules/ejs/lib/ejs.js:549:12), <anonymous>:19:46)
   at returnedFn (/home/sur/surapp/node_modules/ejs/lib/ejs.js:580:17)
   at tryHandleCache (/home/sur/surapp/node_modules/ejs/lib/ejs.js:223:34)
   at View.exports.renderFile [as engine] (/home/sur/surapp/node_modules/ejs/lib/ejs.js:437:10)
   at View.render (/home/sur/surapp/node_modules/express/lib/view.js:126:8)
   at tryRender (/home/sur/surapp/node_modules/express/lib/application.js:639:10)
   at Function.render (/home/sur/surapp/node_modules/express/lib/application.js:591:3)
   at ServerResponse.render (/home/sur/surapp/node_modules/express/lib/response.js:961:7)
   at /home/sur/surapp/routes/views/pag-articulo.js:142:17
   at /home/sur/surapp/node_modules/async/dist/async.js:473:16
   at processQueue (/home/sur/surapp/node_modules/async/dist/async.js:1564:20)
   at taskComplete (/home/sur/surapp/node_modules/async/dist/async.js:1587:9)
   at /home/sur/surapp/node_modules/async/dist/async.js:1611:17
   at /home/sur/surapp/node_modules/async/dist/async.js:958:16
   at /home/sur/surapp/routes/views/pag-articulo.js:135:13
   at Query.<anonymous> (/home/sur/surapp/node_modules/mongoose/lib/query.js:2180:28)