Handle UIB interactions for ignoring channels.

redbot/core/_settings_caches.py

@@ -161,14 +161,18 @@ async def get_ignored_channel(
             discord.StageChannel,
             discord.ForumChannel,
             discord.Thread,
+            discord.Object,  # This is solely here for the purpose of User Installed Bots,
+            # See Red#6501 & ignored_channel_or_guild in redbot/core/bot.py for more details.
         ],
         check_category: bool = True,
     ) -> bool:
         ret: bool
 
         cid: int = channel.id
         cat_id: Optional[int] = (
-            channel.category.id if check_category and channel.category else None
+            channel.category.id
+            if check_category and hasattr(channel, "category") and channel.category is not None
+            else None
         )
         if cid in self._cached_channels:
             chan_ret = self._cached_channels[cid]

redbot/core/bot.py

@@ -911,7 +911,18 @@ async def ignored_channel_or_guild(
             return True
 
         if isinstance(ctx.channel, discord.Thread):
-            channel = ctx.channel.parent
+            if isinstance(ctx, discord.Interaction) and ctx.is_user_integration():
+                ctx: discord.Interaction
+                # This is a user installed interaction, and thus... We're doomed!
+                # We must mock an object because we don't have the channel cached,
+                # and we are unable to fetch a full channel from the interaction
+                # #BlameDiscord, See Red#6501 for more details.
+
+                # LIMITATIONS: Due the fact that we don't know the categories either as they aren't...
+                # communicated in the interaction, we can't check for category ignores.
+                channel = discord.Object(id=ctx.channel.parent_id)
+            else:
+                channel = ctx.channel.parent
             thread = ctx.channel
         else:
             channel = ctx.channel