I was happily writing code a few days ago when suddenly my browser started showing me this nasty error on literally every page I loaded. After looking through damn near every line of my application, I realized that it wasn't my application at all, it was something in the browser. And, in fact, it was dealing with extensions. So I shut them off, one by one, until I discovered that it was LastPass' chrome extension that was the problem!
The error is:
Error in event handler for (unknown): TypeError: Cannot read property 'windowID' of null
at Object.handleResponse (chrome-extension://hdokiejnpimakedhajhdlcegeplioahd/onloadwff.js:58:757012)
at r (chrome-extension://hdokiejnpimakedhajhdlcegeplioahd/onloadwff.js:58:783163)
at r (chrome-extension://hdokiejnpimakedhajhdlcegeplioahd/onloadwff.js:58:5475)
Please, please, please fix this, asap!