# Buggy code
def process_input(cls, query: Union[LocalPath, lavalink.Track, "Query", str], **kwargs):
    """
    A replacement for :code:`lavalink.Player.load_tracks`.
    This will try to get a valid cached entry first if not found or if in valid
    it will then call the lavalink API.

    Parameters
    ----------
    query : Union[Query, LocalPath, lavalink.Track, str]
        The query string or LocalPath object.
    Returns
    -------
    Query
        Returns a parsed Query object.
    """
    if not query:
        query = "InvalidQueryPlaceHolderName"
    possible_values = dict()

    if isinstance(query, str):
        query = query.strip("<>")

    elif isinstance(query, Query):
        for key, val in kwargs.items():
            setattr(query, key, val)
        return query
    elif isinstance(query, lavalink.Track):
        possible_values["stream"] = query.is_stream
        query = query.uri

    possible_values.update(dict(**kwargs))
    possible_values.update(cls._parse(query, **kwargs))
    return cls(query, **possible_values)


# 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
def process_input(cls, query: Union[LocalPath, lavalink.Track, "Query", str], **kwargs):
    """A replacement for :code:`lavalink.Player.load_tracks`. This will try to get a valid
    cached entry first if not found or if in valid it will then call the lavalink API.

    Parameters
    ----------
    query : Union[Query, LocalPath, lavalink.Track, str]
        The query string or LocalPath object.
    Returns
    -------
    Query
        Returns a parsed Query object.
    """
    if not query:
        query = "InvalidQueryPlaceHolderName"
    possible_values = {}

    if isinstance(query, str):
        query = query.strip("<>")

    elif isinstance(query, Query):
        for key, val in kwargs.items():
            setattr(query, key, val)
        return query
    elif isinstance(query, lavalink.Track):
        possible_values["stream"] = query.is_stream
        query = query.uri

    possible_values.update(dict(**kwargs))
    possible_values.update(cls._parse(query, **kwargs))
    return cls(query, **possible_values)