> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://help.faaaster.io/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# My Faaaster site shows a blank page or a 500 error

A blank page or a 500 error almost always signals a **fatal PHP error**. Open the site's **Logs** tab and filter on **Errors**: the message will point you to the file or plugin at fault.

> **The most common case**: it happens right after updating, installing or activating a plugin or theme.

## 1. Read the logs

1. Open the site, **Logs** tab.
2. Filter on **Errors**.
3. Read the most recent entries: they usually name the faulty file, and therefore the plugin or theme involved.

![The Errors filter in the Logs tab, which isolates error entries.](https://storage.crisp.chat/users/helpdesk/website/-/9/d/2/d/9d2d3e0b7134b800/act-logs-en_1parlmu.png)

## 2. Roll back

If the problem follows an update, the safest solution is to **restore an earlier backup** from the **Backups** tab.

> **Restoring replaces the site's current state**: anything done since the chosen backup is lost.

## 3. Out of memory?

A blank page can also come from hitting a memory limit. The **Server** tab, **PHP configuration** section, lets you increase the **Memory limit** (`memory_limit`) — 512 MB by default on the Dev and Perso plans (1024 MB maximum), more on higher plans; the maximum allowed depends on your plan's memory.

## 4. See the error in plain text

**Debug mode** (**Server** tab, **Advanced** section) displays errors directly on the pages.

> **Errors will be visible to your visitors.** Turn it on only for the duration of the diagnosis, and turn it off immediately afterwards.