Any site I visit in Chrome today, including Google.com, shows the following error in the console.log:

Uncaught SyntaxError: Invalid shorthand property initializer

The source shows as (unknown). I wonder if I have a bad extension or something. I'd rather not reset Chrome. Are there any other troubleshooting tips?

3 Answers 3


It is reported that disabling the Better History extension fixed it and re-enabling does not relapse. https://bugs.chromium.org/p/chromium/issues/detail?id=754583#c6

  • 1
    Good one, disabling and re-enabling Better History worked for me Aug 15, 2017 at 3:11
  • indeed, this solved the problem for me too Aug 15, 2017 at 12:28
  • 2
    I included sbmarwbth (which was part of the stack trace, as we see in the answer by Lucian Depold) in my google search and got this superuser page. I've been using Better History, and this disable/re-enable fix worked for me as well. Aug 16, 2017 at 2:08
  • Error reappears with this solution for me after some time (1-2 hours of work / web development) Aug 16, 2017 at 8:08
  • @Purplejacket thanks for including sbmarwbth in your comment, that was also how I found this answer! Aug 25, 2017 at 21:39

This is caused by a recent chrome update. Somewhere in the chrome JSVM code they use a "=" where a ":" should be used to assign a value to an object's property:

enter image description here

I think we have to wait for a patch or downgrade chrome.

EDIT: It seems to be something caused by the chrome developer tools: https://stackoverflow.com/questions/17367560/chrome-development-tool-vm-file-from-javascript

Altough searching the dev tools code does not give any match either.

EDIT2: The answer of user gotoken seems to resolve the issue.

enter image description here

EDIT3: Seems that the solution of user gotoken is not a permanent one. Error reappears after some time. BetterHistory Extension needs to be patched.

  • There's no such code in chromium/chrome: cs.chromium.org/search/…
    – wOxxOm
    Aug 12, 2017 at 7:20
  • Same thing is happening here Aug 14, 2017 at 0:01
  • Could not repeat for me after 24+h use of dev tool. By the way, my apologies for possibly off topic, how can I write code which reports same error message on dev tool console and which gives link to a VM JS page same to the screenshot i.stack.imgur.com/y3bVm.png ? I could not find "ahref" or coincident of "document.body.addEventListener" and "auxclick" under my chrome profile folder. I wonder where the code come from. thanks.
    – gotoken
    Aug 17, 2017 at 4:12

The answers are correct. However, I thought maybe a simple process answer would be helpful:

  1. In the address bar enter: chrome://extensions (Press enter to display your extensions.)
  2. The tab label should be "Extensions" and a list of your installed extensions should be on that page.
  3. Look for Better History. Should be near the top if your extensions are ordered by name.
  4. Click on the Enabled checkbox (the check mark should clear).
  5. Click on the Enabled checkbox again and the check mark should reappear.

That's it. You will probably have to refresh the tab where you're getting the error.

If this was too simple then please let me know.

Further. I found that this didn't solve the problem once and for all. I'm using Vue and Webpack and found that the error eventually (generally after a few restarts) returns. Reset the enabled checkbox again and it goes away again. I guess we're just going to have to live with it until the bug is fixed!

  • 1
    My experience is that disabling/enabling is only a temporary fix. I keep it disabled until I need to use it.
    – Shawn
    Aug 23, 2017 at 16:14

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