# Buggy code
def get_alias_fqon(self, fqon):
    """
    Find the (shortened) fqon by traversing the tree to the fqon node and
    then going upwards until a marked node is found.
    """
    # Traverse the tree downwards
    current_node = self.root
    for part in fqon:
        current_node = current_node.get_child(part)

    # Traverse the tree upwards
    sfqon = []
    while current_node.depth > 0:
        sfqon.insert(0, current_node.name)

        if current_node.alias:
            break

        current_node = current_node.parent

    return tuple(sfqon)


# Traceback (KeyError)
INFO [py] launching openage v0.4.1-377-g2be30ba76
INFO [py] compiled by GNU 10.2.0
Do you want to convert assets? [Y/n]
Y
Should we call wine to determine an AOE installation? [Y/n]
n
Could not find any installation directory automatically.
Please enter an AOE2 install path manually.
/home/schatzi/nvme/Steam/steamapps/common/AoE2DE/
converting from '/home/schatzi/nvme/Steam/steamapps/common/AoE2DE'
INFO [py] Game edition detected:
INFO [py]  * Age of Empires 2: Definitive Edition
INFO [py] converting metadata
INFO [py] [0] palette
INFO [py] [1] empires.dat
INFO [py] Starting conversion...
INFO [py] Extracting Genie data...
INFO [py] Creating API-like objects...
INFO [py] Linking API-like objects...
INFO [py] Generating auxiliary objects...
INFO [py] Creating nyan objects...
Traceback (most recent call last):
File "/usr/bin/openage", line 15, in <module>
main()
File "/usr/lib/python3.9/site-packages/openage/__main__.py", line 132, in main
return args.entrypoint(args, cli.error)
File "/usr/lib/python3.9/site-packages/openage/game/main.py", line 71, in main
used_asset_path = convert_assets(
File "/usr/lib/python3.9/site-packages/openage/convert/main.py", line 100, in convert_assets
for current_item in convert(args):
File "/usr/lib/python3.9/site-packages/openage/convert/tool/driver.py", line 48, in convert
yield from convert_metadata(args)
File "/usr/lib/python3.9/site-packages/openage/convert/tool/driver.py", line 96, in convert_metadata
modpacks = args.converter.convert(gamespec,
File "/usr/lib/python3.9/site-packages/openage/convert/processor/conversion/de2/processor.py", line 63, in convert
modpacks = cls._post_processor(dataset)
File "/usr/lib/python3.9/site-packages/openage/convert/processor/conversion/de2/processor.py", line 153, in _post_processor
DE2NyanSubprocessor.convert(full_data_set)
File "/usr/lib/python3.9/site-packages/openage/convert/processor/conversion/de2/nyan_subprocessor.py", line 38, in convert
cls._process_game_entities(gamedata)
File "/usr/lib/python3.9/site-packages/openage/convert/processor/conversion/de2/nyan_subprocessor.py", line 120, in _process_game_entities
cls.tech_group_to_tech(tech_group)
File "/usr/lib/python3.9/site-packages/openage/convert/processor/conversion/de2/nyan_subprocessor.py", line 596, in tech_group_to_tech
patches.extend(DE2TechSubprocessor.get_patches(tech_group))
File "/usr/lib/python3.9/site-packages/openage/convert/processor/conversion/de2/tech_subprocessor.py", line 147, in get_patches
patches.extend(cls.resource_modify_effect(converter_group,
File "/usr/lib/python3.9/site-packages/openage/convert/processor/conversion/de2/tech_subprocessor.py", line 276, in resource_modify_effect
upgrade_func = DE2TechSubprocessor.upgrade_resource_funcs[resource_id]
KeyError:  208

# Fixed code
def get_alias_fqon(self, fqon, namespace=None):
    """
    Find the (shortened) fqon by traversing the tree to the fqon node and
    then going upwards until an alias is found.

    :param fqon: Object reference for which an alias should be found.
    :type fqon: tuple
    :param namespace: Identifier of a namespace. If this is a (nested) object,
                      we check if the fqon is in the namespace before
                      searching for an alias.
    :type namespace: tuple
    """
    if namespace:
        current_node = self.root

        if len(namespace) <= len(fqon):
            # Check if the fqon is in the namespace by comparing their identifiers
            for index in range(len(namespace)):
                current_node = current_node.get_child(namespace[index])

                if namespace[index] != fqon[index]:
                    break

            else:
                # Check if the namespace node is an object
                if current_node.node_type in (NodeType.OBJECT, NodeType.NESTED):
                    # The object with the fqon is nested and we don't have to look
                    # up an alias
                    return (fqon[-1],)

    # Traverse the tree downwards
    current_node = self.root
    for part in fqon:
        current_node = current_node.get_child(part)

    # Traverse the tree upwards
    sfqon = []
    while current_node.depth > 0:
        if current_node.alias:
            sfqon.insert(0, current_node.alias)
            current_node.mark()
            break

        sfqon.insert(0, current_node.name)

        current_node = current_node.parent

    if not current_node.alias:
        print(fqon)

    return tuple(sfqon)