This Python script crashes Piston (websockets)

[Brikaa]

#!/bin/python3

import asyncio
import websockets
import json

URL = 'ws://127.0.0.1:2000/api/v2/connect'
SOURCE_CODE = 'echo \\"Hello World!\\"\\nsleep 1\\necho \\"Ok\\"'
JSON_STRING = f'{{ "type": "init", "language": "bash", "version": "*", "files": [{{ "content": "{SOURCE_CODE}" }}]}}'
print(JSON_STRING)

async def run():
    async with websockets.connect(URL) as websocket:
        await websocket.send(JSON_STRING)
        msg = await websocket.recv()

asyncio.run(run())

piston_api   | node:internal/errors:415
piston_api   |     ErrorCaptureStackTrace(err);
piston_api   |     ^
piston_api   | 
piston_api   | Error: kill ESRCH
piston_api   |     at process.kill (node:internal/process/per_thread:212:13)
piston_api   |     at Timeout._onTimeout (/piston_api/src/job.js:171:33)
piston_api   |     at listOnTimeout (node:internal/timers:557:17)
piston_api   |     at processTimers (node:internal/timers:500:7) {
piston_api   |   errno: -3,
piston_api   |   code: 'ESRCH',
piston_api   |   syscall: 'kill'
piston_api   | }

In the Python script we don't receive further messages from the websocket