diff --git a/lib/irc.js b/lib/irc.js
index 5abc7f77..4617c120 100644
--- a/lib/irc.js
+++ b/lib/irc.js
@@ -294,7 +294,7 @@ function Client(server, nick, opt) {
                             } else {
                                 channel.modeParams[mode] = [param];
                             }
-                        } else {
+                        } else if (channel.modeParams[mode]) {
                             if (arr) {
                                 channel.modeParams[mode] = channel.modeParams[mode]
                                     .filter(function(v) { return v !== param[0]; });