Extension Error: Cannot attach to this target.

[jurvalz]

Lighthouse Version: 3.0.3
Lighthouse Commit: d1cae24
Chrome Version: 69.0.3497.81
Initial URL: https://inleggo.io/login
Error Message: Cannot attach to this target.
Stack Trace:

Error: Cannot attach to this target.
    at Object.chrome.debugger.attach [as callback] (chrome-extension://blipmdconlkpinefehnmjammfjpmpbjk/scripts/lighthouse-ext-background.js:17315:15)
    at safeCallbackApply (extensions::uncaught_exception_handler:27:15)
    at handleResponse (extensions::sendRequest:67:7)

[paulirish]

thanks very much for reporting. this is a top bug for us right now.
@jurvalz does it occur every time you try to run Lighthouse?

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duping into #5798