1484764 - TypeError: this.netmonitors is null

Status: RESOLVED FIXED

(DevTools :: Console, defect)

Description

[Osmose [:osmose, :mkelly]]

This bug was automatically filed from Sentry: https://sentry.prod.mozaws.net/operations/nightly-js-errors/issues/4564090/

TypeError: this.netmonitors is null

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Getting between 1500 to 3500 of these a day. It first showed up August 17th in build 20180816220128. I suspect it's still rising as the update circulates out.

The error is coming from resource://devtools/server/actors/webconsole.js (no line info *sigh*).  The only suspicious use of netmonitors to my eyes is here, where it's referenced without a null check in an event handler: https://searchfox.org/mozilla-central/source/devtools/server/actors/webconsole.js#1821

Every other use seems to have a null check.

Comment 1

[Nicolas Chevobbe [:nchevobbe]]

cc ochameau since this was probably introduced by Bug 1479524.

Comment 2

[Alexandre Poirot [:ochameau]]

Attachment: Bug 1484764 - Prevent netmonitors is undefined exception when closing tools during page load. r=Honza

Comment 3

[Alexandre Poirot [:ochameau]]

try run:
  https://treeherder.mozilla.org/#/jobs?repo=try&revision=d2d64d08cb5ef587c6ca321503f0c64a815309d5

Comment 4

[Jan Honza Odvarko [:Honza] (always need-info? me)]

Comment on attachment 9002699 [details]
Bug 1484764 - Prevent netmonitors is undefined exception when closing tools during page load. r=Honza

Jan Honza Odvarko [:Honza] has approved the revision.

Comment 5

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/6bfff0d1a5a4
Prevent netmonitors is undefined exception when closing tools during page load. r=Honza

Comment 6

[Noemi Erli[:noemi_erli]]

https://hg.mozilla.org/mozilla-central/rev/6bfff0d1a5a4