Seldaek/monolog · error · LogicException

The wrapped handler does not implement Monolog\Handler\Forma

Error message

The wrapped handler does not implement Monolog\Handler\FormattableHandlerInterface

What it means

Error "The wrapped handler does not implement Monolog\Handler\FormattableHandlerInterface" thrown in Seldaek/monolog.

Source

Thrown at src/Monolog/Handler/HandlerWrapper.php:113

        if ($this->handler instanceof ProcessableHandlerInterface) {
            return $this->handler->popProcessor();
        }

        throw new \LogicException('The wrapped handler does not implement ' . ProcessableHandlerInterface::class);
    }

    /**
     * @inheritDoc
     */
    public function setFormatter(FormatterInterface $formatter): HandlerInterface
    {
        if ($this->handler instanceof FormattableHandlerInterface) {
            $this->handler->setFormatter($formatter);

            return $this;
        }

        throw new \LogicException('The wrapped handler does not implement ' . FormattableHandlerInterface::class);
    }

    /**
     * @inheritDoc
     */
    public function getFormatter(): FormatterInterface
    {
        if ($this->handler instanceof FormattableHandlerInterface) {
            return $this->handler->getFormatter();
        }

        throw new \LogicException('The wrapped handler does not implement ' . FormattableHandlerInterface::class);
    }

    public function reset(): void
    {
        if ($this->handler instanceof ResettableInterface) {
            $this->handler->reset();

View on GitHub (pinned to 57eb102834)

When it happens

Trigger: Thrown at src/Monolog/Handler/HandlerWrapper.php:113 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of Seldaek/monolog@57eb102834 (2026-08-17). Data as JSON: /api/errors/94739b77408f1efb. Report an issue: GitHub.