Troubleshooting and FAQs

FAQs

Are web workers supported?

Yes. Error tracking will work as long as you initialize PostHog in the web worker. You will need to disable any features that rely on the window object:

posthog.init(token, {
    ...
    autocapture: false,
    capture_pageview: false,
    capture_pageleave: false,
    disable_session_recording: true,
    disable_surveys: true,
});

To identify users in web workers you will need to pass the distinct ID. This can be done via an env variable or sending it via postMessage from your main application.

Can exceptions be sampled / ignored

Returning null for a given event in the before_send hook will cause it not to be captured. You may want to:

• Drop certain types of exceptions
• Randomly sample a subset of all exceptions
• Sample based on the events properties (e.g. URL or user)