[Python] Malfunctioning Keybinding with python prompt_toolkit package

I have this block of code in my python CLI app:

from prompt_toolkit.key_binding import KeyBindings
from prompt_toolkit.keys import Keys
from prompt_toolkit.application import run_in_terminal
#Other irrelevent code
binding = KeyBindings()
@binding.add('c-l')
def _(event):
clear_screen()
@binding.add('c-x')
def _(event):
def save():
save = confirm("Wanna save the current state: ",suffix="[y/N]" )
if save:
print(to_do_list.save_current_state(json_data_file))
else:
print('Data not saved.')
event.app.exit()
run_in_terminal(save)


The Ctrl+l keybinding works flawlessly yet thr Ctrl+x one won't work.
Any help would be much appreciated.

I searched and ran throught the documentation yet it wasn't much help.
I tried this fix provided by claude AI:

from prompt_toolkit.application import get_app

@binding.add('c-x')
def _(event):
app = get_app()

def save():
save_confirmed = confirm("Do you want to save the current state? ", suffix="[y/N] ")
if save_confirmed:
print(to_do_list.save_current_state(json_data_file))
else:
print('Data not saved.')
app.exit()

app.loop.call_soon_threadsafe(save)


But didn't work.

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