core-bundle/src/Framework/ContaoFramework.php
public function initialize(bool $isFrontend = false): void
    {
        if ($this->isInitialized()) {
            return;
        }

        // Set before calling any methods to prevent recursion
        self::$initialized = true;

        if (null === $this->container) {
            throw new \LogicException('The service container has not been set.');
        }

        $this->isFrontend = $isFrontend;
        $this->request = $this->requestStack->getMasterRequest();

        $this->setConstants();
        $this->initializeFramework();
    }
public function initialize(bool $isFrontend = false): void
    {
        if ($this->isInitialized()) {
            return;
        }

        // Set before calling any methods to prevent recursion
        self::$initialized = true;

        if (null === $this->container) {
            throw new \LogicException('The service container has not been set.');
        }

        $this->isFrontend = $isFrontend;
        $this->request = $this->requestStack->getMasterRequest();

        $this->setConstants();
        $this->initializeFramework();
    }
{@inheritdoc}

@throws \LogicException