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Cannot read properties of undefined (reading 'fetchStart')

See original GitHub issue

After deploying RUM, I don’t seem to get data from some users. Got their data in Sentry though, so here it is:

Browser

name	Chrome
version	96.0.4664

OS

Name	Windows
Version	10

SDK

Name	@elastic/apm-rum
Version	5.9.1

Stacktrace

TypeError: Cannot read properties of undefined (reading 'fetchStart')
  at ? (./node_modules/@elastic/apm-rum-core/dist/es/common/compress.js:115:27)
  at Array.forEach(<anonymous>)
  at compressMarks(./node_modules/@elastic/apm-rum-core/dist/es/common/compress.js:113:31)
  at compressTransaction(./node_modules/@elastic/apm-rum-core/dist/es/common/compress.js:195:8)
  at ? (./node_modules/@elastic/apm-rum-core/dist/es/common/apm-server.js:313:94)
  at Array.map(<anonymous>)
  at ndjsonTransactions(./node_modules/@elastic/apm-rum-core/dist/es/common/apm-server.js:291:25)
  at sendEvents(./node_modules/@elastic/apm-rum-core/dist/es/common/apm-server.js:359:87)
  at onFlush(./node_modules/@elastic/apm-rum-core/dist/es/common/apm-server.js:33:27)
  at flush(./node_modules/@elastic/apm-rum-core/dist/es/common/queue.js:34:10)
  at apply(./node_modules/@elastic/apm-rum-core/dist/es/common/queue.js:20:20)
  at r(./node_modules/@sentry/browser/esm/helpers.js:72:23)

It seems to work for most users, and not for some others.

Issue Analytics

State:
Created 2 years ago
Comments:5 (3 by maintainers)

Top GitHub Comments

1reaction

kanadajcommented, Dec 1, 2021

Ah sorry, only saw your reply just now, sorry about the lack of a reply! Thankfully you were able to reproduce, I found it hard to repro it reliably at all. Please LMK once this is fixed, atm it makes me unable to gather data from a subset of users.

0reactions

devcorpiocommented, Dec 9, 2021

Hi @kanadaj a new release with the fix is available.