Cannot read property 'getElementsByTagName' of null on chrome debug console

[aliuosio]

(index):5440 Uncaught TypeError: Cannot read property 'getElementsByTagName' of null
at (index):5440
at Object.execCb (require.js:1650)
at Module.check (require.js:866)
at Module. (require.js:1113)
at require.js:132
at require.js:1156
at each (require.js:57)
at Module.emit (require.js:1155)
at Module.check (require.js:917)
at Module.enable (require.js:1143)