Uncaught TypeError: Cannot read property 'processes' of undefined

[nandak522]

The extension doesn't seem to work on latest Chrome 42.0.2311.152 (64-bit). I'm on Linux. Here it the error I am seeing when I inspect the popup:

Uncaught TypeError: Cannot read property 'processes' of undefined at popup.js line 9

[wmertens]

In Chrome 63 with experimental APIs enabled, it has the processes key (but cpu is always 0)