# Jupyter server crashes with an error every couple of hours

**URL:** <https://discourse.jupyter.org/t/jupyter-server-crashes-with-an-error-every-couple-of-hours/11623>\
**Category:** Notebook\
**Created:** [November 10, 2021, 4:22pm UTC](https://discourse.jupyter.org/t/jupyter-server-crashes-with-an-error-every-couple-of-hours/11623 "2021-11-10T16:22:53Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![borgdrone7](https://yyz1.discourse-cdn.com/flex031/user_avatar/discourse.jupyter.org/borgdrone7/32/5670_2.png) [@borgdrone7](https://discourse.jupyter.org/u/borgdrone7)\
**Post date:** [November 10, 2021, 4:22pm UTC](https://discourse.jupyter.org/t/jupyter-server-crashes-with-an-error-every-couple-of-hours/11623/1 "2021-11-10T16:22:53Z")

</div>

The log in the Jupyter server is:

[I 11:32:08.368 NotebookApp] 302 GET / (92.118.161.13) 0.79ms  
[I 11:45:08.327 NotebookApp] 302 GET / (136.144.41.219) 0.71ms  
[I 11:45:08.722 NotebookApp] 302 POST /login?next=/tree? (136.144.41.219) 1.69ms  
[I 11:45:09.708 NotebookApp] New terminal with automatic name: 1  
[E 11:45:09.947 NotebookApp] Uncaught exception GET /terminals/websocket/1 (136.144.41.219)  
HTTPServerRequest(protocol=‘http’, host=‘76.72.163.213:8888’, method=‘GET’, uri=’/terminals/websocket/1’, version=‘HTTP/1.1’, remote\_ip=‘136.144.41.219’)  
Traceback (most recent call last):  
File “/usr/local/lib/python3.9/site-packages/tornado/websocket.py”, line 647, in \_run\_callback  
result = callback(\*args, \*\*kwargs)  
File “/usr/local/lib/python3.9/site-packages/notebook/terminal/handlers.py”, line 39, in on\_message  
super(TermSocket, self).on\_message(message)  
File “/usr/local/lib/python3.9/site-packages/terminado/websocket.py”, line 86, in on\_message  
command = json.loads(message)  
File “/usr/local/lib/python3.9/json/ **init**.py”, line 346, in loads  
return \_default\_decoder.decode(s)  
File “/usr/local/lib/python3.9/json/decoder.py”, line 337, in decode  
obj, end = self.raw\_decode(s, idx=\_w(s, 0).end())  
File “/usr/local/lib/python3.9/json/decoder.py”, line 353, in raw\_decode  
obj, end = self.scan\_once(s, idx)  
json.decoder.JSONDecodeError: Expecting ‘,’ delimiter: line 1 column 19 (char 18)  
Killed  
[IPKernelApp] WARNING | Parent appears to have exited, shutting down.

Versions:  
Jupyter Notebook 6.1.5  
jupyter==1.0.0  
jupyter-client==6.1.7  
jupyter-console==6.2.0  
jupyter-core==4.6.3  
jupyterlab-pygments==0.1.2  
tornado==6.1  
terminado==0.9.1

I know previously there was an issue with tornado being too new but that was for lower versions of Jupyter server, is there some newer issue which could cause this?

Thanks