message: check that encryptionInfo.sender is set
diff: @@ -333,7 +333,7 @@ export default createReactClass({
  return;
  }
  - const eventSenderTrust = this.context.checkDeviceTrust(
  + const eventSenderTrust = encryptionInfo.sender && this.context.checkDeviceTrust(
  senderId, encryptionInfo.sender.deviceId,
  );
  if (!eventSenderTrust) {
  