# MumbleServer::InvalidSessionException

## Overview

### exception InvalidSessionException extends MurmurException

This is thrown when you specify an invalid session. This may happen if the user has disconnected since your last call to Server::getUsers. See User::session

#### Used By

Server::addUserToGroup
Server::effectivePermissions
Server::getCertificateList
Server::getState
Server::hasPermission
Server::kickUser
Server::redirectWhisperGroup
Server::removeUserFromGroup
Server::sendMessage
Server::setState