Cannot read property 'toUpperCase' of null

[ocangelo]

I am still on 0.7.9, noticed this error in the console

VM1028:8 TypeError: Cannot read property 'toUpperCase' of null
    at layer-hotkeys.js:200
    at Function._call (eval at <anonymous> (libWrapper-errors.js:249), <anonymous>:4:14)
    at Function.call (foundry.js:2481)
    at SceneControls._render (foundry.js:4547)

seems a pretty straightforward fix as you are not checking for null here

if (key !== undefined) li.title += " [" + key.toUpperCase() + "]";