# Buggy code
async def shuffle(self, ctx: commands.Context):
    """Toggle shuffle."""
    dj_enabled = await self.config.guild(ctx.guild).dj_enabled()
    if dj_enabled:
        if not await self._can_instaskip(ctx, ctx.author):
            return await self._embed_msg(
                ctx, _("You need the DJ role to toggle shuffle.")
            )
    if self._player_check(ctx):
        await self._data_check(ctx)
        player = lavalink.get_player(ctx.guild.id)
        if (
            not ctx.author.voice or ctx.author.voice.channel != player.channel
        ) and not await self._can_instaskip(ctx, ctx.author):
            return await self._embed_msg(
                ctx, _("You must be in the voice channel to toggle shuffle.")
            )

    shuffle = await self.config.guild(ctx.guild).shuffle()
    await self.config.guild(ctx.guild).shuffle.set(not shuffle)
    await self._embed_msg(
        ctx,
        _("Shuffle tracks: {true_or_false}.").format(
            true_or_false=_("Enabled") if not shuffle else _("Disabled")
        ),
    )
    if self._player_check(ctx):
        await self._data_check(ctx)


# 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 shuffle(self, ctx: commands.Context):
    """Toggle shuffle."""
    if ctx.invoked_subcommand is None:
        dj_enabled = self._dj_status_cache.setdefault(
            ctx.guild.id, await self.config.guild(ctx.guild).dj_enabled()
        )
        if dj_enabled:
            if not await self._can_instaskip(ctx, ctx.author):
                return await self._embed_msg(
                    ctx,
                    title=_("Unable To Toggle Shuffle"),
                    description=_("You need the DJ role to toggle shuffle."),
                )
        if self._player_check(ctx):
            await self._data_check(ctx)
            player = lavalink.get_player(ctx.guild.id)
            if (
                not ctx.author.voice or ctx.author.voice.channel != player.channel
            ) and not await self._can_instaskip(ctx, ctx.author):
                return await self._embed_msg(
                    ctx,
                    title=_("Unable To Toggle Shuffle"),
                    description=_(
                        "You must be in the voice channel to toggle shuffle."
                    ),
                )

        shuffle = await self.config.guild(ctx.guild).shuffle()
        await self.config.guild(ctx.guild).shuffle.set(not shuffle)
        await self._embed_msg(
            ctx,
            title=_("Setting Changed"),
            description=_("Shuffle tracks: {true_or_false}.").format(
                true_or_false=_("Enabled") if not shuffle else _("Disabled")
            ),
        )
        if self._player_check(ctx):
            await self._data_check(ctx)