/usr/local/lib/node_modules/homebridge-homeassistant/accessories/light.js:43
    if (old_state.state != new_state.state) {
                 ^

TypeError: Cannot read property 'state' of null
    at Object.HomeAssistantLight.onEvent (/usr/local/lib/node_modules/homebridge-homeassistant/accessories/light.js:43:18)
    at Object.<anonymous> (/usr/local/lib/node_modules/homebridge-homeassistant/index.js:69:19)
    at emitOne (events.js:77:13)
    at EventSource.emit (events.js:169:7)
    at _emit (/usr/local/lib/node_modules/homebridge-homeassistant/node_modules/eventsource/lib/eventsource.js:181:17)
    at parseEventStreamLine (/usr/local/lib/node_modules/homebridge-homeassistant/node_modules/eventsource/lib/eventsource.js:196:9)
    at IncomingMessage.<anonymous> (/usr/local/lib/node_modules/homebridge-homeassistant/node_modules/eventsource/lib/eventsource.js:159:11)
    at emitOne (events.js:77:13)
    at IncomingMessage.emit (events.js:169:7)
    at readableAddChunk (_stream_readable.js:146:16)
    at IncomingMessage.Readable.push (_stream_readable.js:110:10)
    at HTTPParser.parserOnBody (_http_common.js:109:22)
    at Socket.socketOnData (_http_client.js:305:20)
    at emitOne (events.js:77:13)
    at Socket.emit (events.js:169:7)
    at readableAddChunk (_stream_readable.js:146:16)
    at Socket.Readable.push (_stream_readable.js:110:10)
    at TCP.onread (net.js:523:20)