rewrite: Various bugfixes.

src/modules/rooms/cog.py

@@ -586,7 +586,7 @@ class RoomCog(LionCog):
                             t(_p(
                                 'cmd:room_invite|error:member_not_found',
                                 "Could not find the invited member {mention} in this server!"
-                            )).format(member=f"<@{mid}>")
+                            )).format(mention=f"<@{mid}>")
                         ), ephemeral=True
                     )
                     return

src/modules/rooms/room.py

@@ -88,6 +88,8 @@ class Room:
                 pass
 
     async def add_new_members(self, memberids):
+        # Ensure members exist
+        await self.bot.core.lions.fetch_members(*((self.data.guildid, mid) for mid in memberids))
         member_data = self.bot.get_cog('RoomCog').data.RoomMember
         await member_data.table.insert_many(
             ('channelid', 'userid'),