filp/whoops · error · Exception

Whoops\Exception\FrameCollection is read only

Error message

Whoops\Exception\FrameCollection is read only

What it means

Error "Whoops\Exception\FrameCollection is read only" thrown in filp/whoops.

Source

Thrown at src/Whoops/Exception/FrameCollection.php:123

    /**
     * @see ArrayAccess::offsetGet
     * @param int $offset
     */
    #[ReturnTypeWillChange]
    public function offsetGet($offset)
    {
        return $this->frames[$offset];
    }

    /**
     * @see ArrayAccess::offsetSet
     * @param int $offset
     */
    #[ReturnTypeWillChange]
    public function offsetSet($offset, $value)
    {
        throw new \Exception(__CLASS__ . ' is read only');
    }

    /**
     * @see ArrayAccess::offsetUnset
     * @param int $offset
     */
    #[ReturnTypeWillChange]
    public function offsetUnset($offset)
    {
        throw new \Exception(__CLASS__ . ' is read only');
    }

    /**
     * @see Countable::count
     * @return int
     */
    #[ReturnTypeWillChange]
    public function count()

View on GitHub (pinned to fa1bc9c95a)

When it happens

Trigger: Thrown at src/Whoops/Exception/FrameCollection.php:123 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of filp/whoops@fa1bc9c95a (2026-08-21). Data as JSON: /api/errors/a4778b1823ed64e9. Report an issue: GitHub.