From aa40936ce6e95b488863140072a32704f15df01e Mon Sep 17 00:00:00 2001
From: jesopo <github@lolnerd.net>
Date: Wed, 16 Jan 2019 11:47:42 +0000
Subject: [PATCH] Support a mode being removed from a channel, without an arg,
 that we weren't yet aware of (src/IRCChannel.py)

---
 src/IRCChannel.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/IRCChannel.py b/src/IRCChannel.py
index aeb0b784..10f43edb 100644
--- a/src/IRCChannel.py
+++ b/src/IRCChannel.py
@@ -64,7 +64,7 @@ class Channel(IRCObject.Object):
             else:
                 self.modes[mode].add(arg.lower())
     def remove_mode(self, mode: str, arg: str=None):
-        if not arg:
+        if not arg and mode in self.modes:
             del self.modes[mode]
         else:
             if mode in self.server.prefix_modes: