# Question about the event "Page not found"

**URL:** <https://forum.pirsch.io/t/question-about-the-event-page-not-found/163>\
**Category:** Support\
**Created:** [December 5, 2025, 1:56pm UTC](https://forum.pirsch.io/t/question-about-the-event-page-not-found/163 "2025-12-05T13:56:19Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![MarieFürstenberg](https://forum.pirsch.io/letter_avatar_proxy/v4/letter/m/ecae2f/32.png) [@MarieFürstenberg](https://forum.pirsch.io/u/MarieF%C3%BCrstenberg)\
**Post date:** [December 5, 2025, 1:56pm UTC](https://forum.pirsch.io/t/question-about-the-event-page-not-found/163/1 "2025-12-05T13:56:19Z")

</div>

Hello,

Recently, the “Page not found” event has been appearing very frequently in our statistics. I filtered for this event and looked at the event pages, and I’m surprised because all the listed pages exist and can be accessed without any problems.

Therefore, my questions are:

1. Did I filter correctly to see the pages that were not found?

2. If so, why are pages that already exist listed there?

Best regards, Heiko

 ![pagenotfound](https://forum.pirsch.io/uploads/default/original/1X/f7a3e14b80b17813c7cda2faf8f844ae59498b0f.png)

---

<div class="post-metadata">

**Author:** ![Marvin](https://forum.pirsch.io/user_avatar/forum.pirsch.io/marvin/32/16_2.png) [@Marvin](https://forum.pirsch.io/u/Marvin)\
**Post date:** [December 5, 2025, 1:59pm UTC](https://forum.pirsch.io/t/question-about-the-event-page-not-found/163/2 "2025-12-05T13:59:13Z")

</div>

Hi Heiko,

The “Page Not Found” event is triggered manually, so I would assume that you mistakenly run it on them?

Could you check the pages to see if the code from our docs is present (or just the event call: pirschNotFound)?

```auto
<script>
    document.addEventListener("readystatechange", () => {
        if (document.readyState === "complete") {
            pirschNotFound();
        }
    });
</script>

```

> **[Pirsch Analytics Documentation](https://docs.pirsch.io/advanced/not-found-tracking#adding-tracking-to-404-error-pages)**
>
> Pirsch is a simple, privacy-friendly, and open-source web analytics solution.