diff --git a/lib/irc.js b/lib/irc.js
index 23ccfe08..2b58d418 100644
--- a/lib/irc.js
+++ b/lib/irc.js
@@ -411,7 +411,8 @@ function Client(server, nick, opt) {
                 break;
             case 'rpl_whoischannels':
                // TODO - clean this up?
-                self._addWhoisData(message.args[1], 'channels', message.args[2].trim().split(/\s+/));
+                self._addWhoisData(message.args[1], 'channels',
+                  (message.args[2] || '').trim().split(/\s+/));
                 break;
             case 'rpl_whoisserver':
                 self._addWhoisData(message.args[1], 'server', message.args[2]);