src/Router.php
private static function getErrorCallback()
    {
        $errorCallback = self::$errorCallback;

        self::$errorCallback = false;

        if (! $errorCallback) {
            return false;
        }

        if (! is_object($errorCallback)) {
            return self::invokeObject($errorCallback);
        }

        return call_user_func($errorCallback);
    }
private static function getErrorCallback()
    {
        $errorCallback = self::$errorCallback;

        self::$errorCallback = false;

        if (! $errorCallback) {
            return false;
        }

        if (! is_object($errorCallback)) {
            return self::invokeObject($errorCallback);
        }

        return call_user_func($errorCallback);
    }
Get error callback if route does not exists.

@since 1.0.3

@return callable