Function window.console.log Trows Type Error: Invalid calling object While It Should Not

Fixed Issue #14495220


Vladimir K.
Nov 2, 2017
This issue is public.
Found in
  • Microsoft Edge
  • Internet Explorer
Found in build #
Reported by 1 person

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Steps to reproduce

I need to print some debug information in a JS library I’m working on. I’m using
window.console.log, which I need to store in a variable for later usage. When DevTools panel is opened, everything works as expected, but when DevTools panel is closed, the following code throws an exception. I tested other browsers (Firefox, Safari, Chrome, Opera) and none of them behaves this way. I believe no exceptions should be thrown in any state (opened/closed) of DevTools.

// This code should not throw an exception when F12 DevTools are closed
const testBug = function () {
  let log = function () {};
  if (window.console && window.console.log) {
    log = window.console.log;

  log('Bug not found!'); // EXCEPTION TROWN

try {
} catch (e) {

See also:

  1. Test case
  2. Source code of test


0 attachments

    Comments and activity

    • Microsoft Edge Team

      Changed Assigned To to “James M.”

      Changed Assigned To to “”

      Changed Status to “Confirmed”

      Changed Status from “Confirmed”

      Changed Status to “Fixed”

    • Hello,

      Thank you for providing this information about the issue. We are pleased to report this feature is fixed in Edge 17133 and is available in our Insider Preview build on the fast ring.

      Best Wishes,
      The MS Edge Team

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