fix(bot): 🚑 Hangup not working.

payphone/cogs/calls/cog.py

@@ -466,6 +466,7 @@ class Calls(base.Cog):
                 constants.CHANNELS_ONCALL_SET, str(channel_id), str(other_channel.id)
             )
 
+            if other_channel is not None:
                 try:
                     await (await self.bot.get_or_fetch_channel(other_channel.id)).send(
                         f"☎️ {secrets.choice(constants.MSGS_PHONE_HANGUP_YOU)}"
@@ -474,12 +475,13 @@ class Calls(base.Cog):
                 except errors.DiscordException:
                     pass
 
+                other_channel.call = None
+
             await ctx.send(f"☎️ {secrets.choice(constants.MSGS_PHONE_HANGUP_ME)}")
 
             channel.call = None
-            other_channel.call = None
 
-            await models.Channel.bulk_update([channel, other_channel], ["call_id"])
+            await models.Channel.bulk_update([channel] + ([other_channel] if other_channel is not None else []), ["call_id"])
 
             call.ended_at = datetime.now(timezone.utc)
             await call.save()