Web Vitals GetCLS - failing with Cannot read properties of undefined (reading 'startTime')

[doutatsu]

Is there an existing issue for this?

• I have checked for existing issues https://github.com/getsentry/sentry-javascript/issues
• I have reviewed the documentation https://docs.sentry.io/
• I am using the latest SDK release https://github.com/getsentry/sentry-javascript/releases

How do you use Sentry?

Sentry Saas (sentry.io)

Which package are you using?

@sentry/vue

SDK Version

7.17.2

Framework Version

Vue 3.2.40

Link to Sentry event

https://sentry.io/organizations/studio-shogun/issues/3705072282

Steps to Reproduce

Unable to reproduce this issue - it looks to be happening on it's own, coming from the web-vitals dependency. Going by the error message, it must be this part of the code, I presume with session entries being undefined:

  const handleEntries = (entries: LayoutShift[]): void => {
    entries.forEach(entry => {
      // Only count layout shifts without recent user input.
      if (!entry.hadRecentInput) {
        const firstSessionEntry = sessionEntries[0];
        const lastSessionEntry = sessionEntries[sessionEntries.length - 1];

        // If the entry occurred less than 1 second after the previous entry and
        // less than 5 seconds after the first entry in the session, include the
        // entry in the current session. Otherwise, start a new session.
        if (
          sessionValue &&
          entry.startTime - lastSessionEntry.startTime < 1000 &&
          entry.startTime - firstSessionEntry.startTime < 5000
        ) {
          sessionValue += entry.value;
          sessionEntries.push(entry);
        } else {
          sessionValue = entry.value;
          sessionEntries = [entry];
        }

        // If the current session value is larger than the current CLS value,
        // update CLS and the entries contributing to it.
        if (sessionValue > metric.value) {
          metric.value = sessionValue;
          metric.entries = sessionEntries;
          if (report) {
            report();
          }
        }
      }
    });
  };

Expected Result

I shouldn't be getting an error from this library

Actual Result

[AbhiPrasad]

Hey thanks for writing in. This is a duplicate of #6083, so going to close this issue as a result.

[doutatsu]

Thanks - I've tried searching, but somehow missed the existing one still. Apologies about that