Can't launch protonvpn-app from script

[LittleBangTheory]

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Environment

• OS : Ubuntu 24.04.1 LTS
• ProtonVPN : Version 4.6.0, installed from official documentation

Issue

Hello,

For context, i have been trying to execute the protonvpn-app from a script linked to a .desktop file, to automatize the deactivation of my custom DNS when I launch the ProtonVPN, and activation when I close it.

Using the protonvpn-app command from a normal terminal works fine, but when trying in the terminal opened by Ubuntu from the .desktop file, I get this error trace :

Traceback (most recent call last):
  File "/usr/bin/protonvpn-app", line 33, in <module>
    sys.exit(load_entry_point('proton-vpn-gtk-app==4.6.0', 'console_scripts', 'protonvpn-app')())
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/bin/protonvpn-app", line 25, in importlib_load_entry_point
    return next(matches).load()
           ^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/importlib/metadata/__init__.py", line 205, in load
    module = import_module(match.group('module'))
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/importlib/__init__.py", line 90, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen importlib._bootstrap>", line 1387, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1360, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1310, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed
  File "<frozen importlib._bootstrap>", line 1387, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1360, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1331, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 935, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 995, in exec_module
  File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed
  File "/usr/lib/python3/dist-packages/proton/vpn/app/gtk/__init__.py", line 36, in <module>
    logging.config(filename="vpn-app")
  File "/usr/lib/python3/dist-packages/proton/vpn/logging/__init__.py", line 126, in config
    default_logdirpath = os.path.join(VPNExecutionEnvironment().path_cache, "logs")
                                      ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/proton/utils/metaclasses.py", line 25, in __call__
    cls._instances[cls] = super(Singleton, cls).__call__(*args, **kwargs)
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/proton/utils/environment.py", line 116, in __init__
    super().__init__()
  File "/usr/lib/python3/dist-packages/proton/utils/environment.py", line 38, in __init__
    self._setup_as_regular_user()
  File "/usr/lib/python3/dist-packages/proton/utils/environment.py", line 78, in _setup_as_regular_user
    config_home, cache_home, runtime_dir = self._get_dir_paths()
                                           ^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/proton/utils/environment.py", line 91, in _get_dir_paths
    runtime_dir = BaseDirectory.get_runtime_dir()
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/xdg/BaseDirectory.py", line 141, in get_runtime_dir
    return os.environ['XDG_RUNTIME_DIR']
           ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
  File "<frozen os>", line 685, in __getitem__
KeyError: 'XDG_RUNTIME_DIR'

What surprises me is that the XDG_RUNTIME_DIR is well set in the windows where I get the error, and has the same value as in any other windows, being /run/user/1000.

Also, when using env to print all the environnement variables, and trying a diff between the two outputs, the only differences where not meaningful ones, meaning LESSCLOSE, LESSOPEN, LS_COLORS, and the GNOME_TERMINAL_SCREEN that is obviously different.

Additional informations

If of any use, here is the .desktop file :

[Desktop Entry]
Type=Application
Name=VPN  
Categories=Application;Maintenance
Exec=$REDACTED_PATH/vpn.sh
Icon=/usr/share/icons/protonvpn.svg
Terminal=true

Thanks !