Pressing delete crashes application

[bmitchinson]

To Reproduce:

(tested on edge and chromium)

open up a new mydraft.cc document (can be an existing one as well)
click the delete icon on an element (or hit the delete key)

Application crashes:

Uncaught TypeError: Cannot read property 'isLocked' of undefined
    at src.dd5cfa859903f69abebc.js?dd5cfa859903f69abebc:2
    at Array.filter (<anonymous>)
    at src.dd5cfa859903f69abebc.js?dd5cfa859903f69abebc:2
    at src.dd5cfa859903f69abebc.js?dd5cfa859903f69abebc:2
    at src.dd5cfa859903f69abebc.js?dd5cfa859903f69abebc:2
    at src.dd5cfa859903f69abebc.js?dd5cfa859903f69abebc:2
    at Object.getSelectedItems (src.dd5cfa859903f69abebc.js?dd5cfa859903f69abebc:2)
    at Function.mapToProps (src.dd5cfa859903f69abebc.js?dd5cfa859903f69abebc:2)
    at r (src.dd5cfa859903f69abebc.js?dd5cfa859903f69abebc:2)
    at h (src.dd5cfa859903f69abebc.js?dd5cfa859903f69abebc:2)
bm8hdqjudnc606vhirfg:1 Failed to load resource: the server responded with a status of 404 ()