From 5ead38c284cf01546c21e3a3867a25be7992da99 Mon Sep 17 00:00:00 2001
From: Stonedestroyer <1307729+Stonedestroyer@users.noreply.github.com>
Date: Mon, 14 Jun 2021 02:11:55 +0200
Subject: [PATCH] Fix none issue (#5125)

---
 redbot/cogs/filter/filter.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/redbot/cogs/filter/filter.py b/redbot/cogs/filter/filter.py
index 736b79355..0b1086b63 100644
--- a/redbot/cogs/filter/filter.py
+++ b/redbot/cogs/filter/filter.py
@@ -442,7 +442,7 @@ class Filter(commands.Cog):
 
     @commands.Cog.listener()
     async def on_message(self, message: discord.Message):
-        if isinstance(message.channel, discord.abc.PrivateChannel):
+        if message.guild is None:
             return
 
         if await self.bot.cog_disabled_in_guild(self, message.guild):