message: Return undefined if the client is undefined
diff: @@ -358,6 +358,9 @@ DebugApi.prototype.inspectUsers = function(regex, response) {
  const clientsResponse = {};
  Object.keys(userClients).forEach((userId) => {
  clientsResponse[userId] = userClients[userId].map((client) => {
  + if (!client) {
  + return undefined;
  + }
  return {
  channels: client.chanList,
  dead: client.isDead(),
  