Ever since the last update I've been getting these with Monster IRC 1.73 and CB 1.3.2-R1.0.

20:20:47 [SEVERE] java.lang.NullPointerException
20:20:47 [SEVERE] at org.monstercraft.irc.plugin.managers.listeners.IRCEventListener.onMode(IRCEventListener.java:95)
20:20:47 [SEVERE] at org.monstercraft.irc.ircplugin.event.events.PluginModeEvent.dispatch(PluginModeEvent.java:31)
20:20:47 [SEVERE] at org.monstercraft.irc.ircplugin.event.EventMulticaster.fireEvent(EventMulticaster.java:114)
20:20:47 [SEVERE] at org.monstercraft.irc.ircplugin.event.EventMulticaster.fireEvent(EventMulticaster.java:98)
20:20:47 [SEVERE] at org.monstercraft.irc.ircplugin.event.EventManager.processEvent(EventManager.java:67)
20:20:47 [SEVERE] at org.monstercraft.irc.ircplugin.event.EventManager.run(EventManager.java:181)
20:20:47 [SEVERE] at java.lang.Thread.run(Thread.java:722)

On my IRC server all users are forced into a #helpdesk channel. That includes my MonsterIRC bot. Usually I ban it from the #helpdesk channel but that gets reset sometimes and it ends up in that channel. That might be part of what causes these random NPEs.

That seems to be the case, I'll add some debugging tools so I can properly get this fixed. I will send you a copy with the debugging stuff in a little while.