# Buggy code
async def external(self, ctx: commands.Context):
    """Toggle using external lavalink servers."""
    external = await self.config.use_external_lavalink()
    await self.config.use_external_lavalink.set(not external)

    if external:
        embed = discord.Embed(
            colour=await ctx.embed_colour(),
            title=_("External lavalink server: {true_or_false}.").format(
                true_or_false=_("Enabled") if not external else _("Disabled")
            ),
        )
        await ctx.send(embed=embed)
    else:
        if self._manager is not None:
            await self._manager.shutdown()
        await self._embed_msg(
            ctx,
            _("External lavalink server: {true_or_false}.").format(
                true_or_false=_("Enabled") if not external else _("Disabled")
            ),
        )

    self._restart_connect()


# Traceback (RuntimeError)
Traceback (most recent call last):
File "/home/martinebots/martinebotsvenv/lib/python3.7/site-packages/discord/ext/commands/core.py", line 79, in wrapped
ret = await coro(*args, **kwargs)
File "/home/martinebots/martinebotscogs/cogs_modified/audio/audio.py", line 3183, in play
await self._enqueue_tracks(ctx, query)
File "/home/martinebots/martinebotscogs/cogs_modified/audio/audio.py", line 3885, in _enqueue_tracks
result, called_api = await self.music_cache.lavalink_query(ctx, player, query)
File "/home/martinebots/martinebotscogs/cogs_modified/audio/apis.py", line 911, in lavalink_query
results = await player.load_tracks(query)
File "/home/martinebots/martinebotsvenv/lib/python3.7/site-packages/lavalink/rest_api.py", line 300, in load_tracks
self.__check_node_ready()
File "/home/martinebots/martinebotsvenv/lib/python3.7/site-packages/lavalink/rest_api.py", line 268, in __check_node_ready
raise RuntimeError("Cannot execute REST request when node not ready.")
RuntimeError: Cannot execute REST request when node not ready.

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "/home/martinebots/martinebotsvenv/lib/python3.7/site-packages/discord/ext/commands/bot.py", line 863, in invoke
await ctx.command.invoke(ctx)
File "/home/martinebots/martinebotsvenv/lib/python3.7/site-packages/discord/ext/commands/core.py", line 728, in invoke
await injected(*ctx.args, **ctx.kwargs)
File "/home/martinebots/martinebotsvenv/lib/python3.7/site-packages/discord/ext/commands/core.py", line 88, in wrapped
raise CommandInvokeError(exc) from exc
discord.ext.commands.errors.CommandInvokeError: Command raised an exception: RuntimeError: Cannot execute REST request when node not ready.```

# Fixed code
async def external(self, ctx: commands.Context):
    """Toggle using external lavalink servers."""
    external = await self.config.use_external_lavalink()
    await self.config.use_external_lavalink.set(not external)

    if external:
        embed = discord.Embed(
            title=_("Setting Changed"),
            description=_("External lavalink server: {true_or_false}.").format(
                true_or_false=_("Enabled") if not external else _("Disabled")
            ),
        )
        await self._embed_msg(ctx, embed=embed)
    else:
        if self._manager is not None:
            await self._manager.shutdown()
        await self._embed_msg(
            ctx,
            title=_("Setting Changed"),
            description=_("External lavalink server: {true_or_false}.").format(
                true_or_false=_("Enabled") if not external else _("Disabled")
            ),
        )

    self._restart_connect()