diff --git a/plugins/ChannelStats/plugin.py b/plugins/ChannelStats/plugin.py
index d09129bed..dd7943c7a 100644
--- a/plugins/ChannelStats/plugin.py
+++ b/plugins/ChannelStats/plugin.py
@@ -245,6 +245,9 @@ class ChannelStats(callbacks.Plugin):
         necessary if the message isn't sent on the channel itself.  If <name>
         isn't given, it defaults to the user sending the command.
         """
+        if msg.nick not in irc.state.channels[channel].users:
+            irc.error(format('You must be in %s to use this command.', channel))
+            return
         if name and ircutils.strEqual(name, irc.nick):
             id = 0
         elif not name:
@@ -304,6 +307,9 @@ class ChannelStats(callbacks.Plugin):
         'kicks', 'kicked', 'topics', and 'modes'.  Any simple mathematical
         expression involving those variables is permitted.
         """
+        if msg.nick not in irc.state.channels[channel].users:
+            irc.error(format('You must be in %s to use this command.', channel))
+            return
         # XXX I could do this the right way, and abstract out a safe eval,
         #     or I could just copy/paste from the Math plugin.
         if expr != expr.translate(utils.str.chars, '_[]'):
@@ -345,6 +351,9 @@ class ChannelStats(callbacks.Plugin):
         Returns the statistics for <channel>.  <channel> is only necessary if
         the message isn't sent on the channel itself.
         """
+        if msg.nick not in irc.state.channels[channel].users:
+            irc.error(format('You must be in %s to use this command.', channel))
+            return
         try:
             stats = self.db.getChannelStats(channel)
             curUsers = len(irc.state.channels[channel].users)