MISP to Sentinel sync failing

[Networking-G]

Hello there,

The sync from my MISP instance to Microsoft Sentinel is failing.
This is the output from Application logs

I've changed PHP max_memory in the php.ini file and rebooted the server. But the same error still comes up.

This is the output from running the script.py:
└─# python3 script.py
fetching & parsing data from misp...
/root/anaconda3/envs/python3-venv/lib/python3.6/site-packages/urllib3/connectionpool.py:857: InsecureRequestWarning: Unverified HTTPS request is being made. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
InsecureRequestWarning)
WARNING [api.py:82 - init() ] The version of PyMISP recommended by the MISP instance (2.4.169) is newer than the one you're using now (2.4.121.1). Please upgrade PyMISP.
/root/anaconda3/envs/python3-venv/lib/python3.6/site-packages/urllib3/connectionpool.py:857: InsecureRequestWarning: Unverified HTTPS request is being made. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
InsecureRequestWarning)
/root/anaconda3/envs/python3-venv/lib/python3.6/site-packages/urllib3/connectionpool.py:857: InsecureRequestWarning: Unverified HTTPS request is being made. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
InsecureRequestWarning)
/root/anaconda3/envs/python3-venv/lib/python3.6/site-packages/urllib3/connectionpool.py:857: InsecureRequestWarning: Unverified HTTPS request is being made. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
InsecureRequestWarning)
/root/anaconda3/envs/python3-venv/lib/python3.6/site-packages/urllib3/connectionpool.py:857: InsecureRequestWarning: Unverified HTTPS request is being made. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
InsecureRequestWarning)
CRITICAL [api.py:2168 - _check_response() ] Unknown error: the response is not in JSON.
Something is broken server-side, please send us everything that follows (careful with the auth key):
Request headers:
{'User-Agent': 'PyMISP 2.4.121.1 - Python 3.6', 'Accept-Encoding': 'gzip, deflate', 'Accept': 'application/json', 'Connection': 'keep-alive', 'Content-Length': '292', 'Authorization': 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXX', 'content-type': 'application/json'}
Request body:
{"returnFormat": "json", "category": "", "org": "", "withAttachments": 0, "metadata": 0, "enforceWarninglist": 0, "includeEventUuid": 0, "includeEventTags": 0, "sgReferenceOnly": 0, "includeContext": 0, "headerless": 0, "includeSightings": 0, "includeDecayScore": 0, "includeCorrelations": 0}
Response (if any):
{"name":"An Internal Error Has Occurred.","message":"An Internal Error Has Occurred.","url":"/events/restSearch"}
Traceback (most recent call last):
File "script.py", line 100, in
main()
File "script.py", line 69, in main
events = _get_events()
File "script.py", line 18, in _get_events
[event['Event'] for event in misp.search(controller='events', return_format='json', **config.misp_event_filters)]
File "/root/anaconda3/envs/python3-venv/lib/python3.6/site-packages/pymisp/api.py", line 1524, in search
normalized_response = self._check_json_response(response)
File "/root/anaconda3/envs/python3-venv/lib/python3.6/site-packages/pymisp/api.py", line 2160, in _check_json_response
r = self._check_response(response, expect_json=True)
File "/root/anaconda3/envs/python3-venv/lib/python3.6/site-packages/pymisp/api.py", line 2169, in _check_response
raise MISPServerError(f'Error code 500:\n{response.text}')
pymisp.exceptions.MISPServerError: Error code 500:
{"name":"An Internal Error Has Occurred.","message":"An Internal Error Has Occurred.","url":"/events/restSearch"}

The strange things is MISP was able to do the initial sync. Not sure if it fully finished or not but within the day sync stopped and I don't know enough of Python to figure out what needs changing to get it back up and running.

Any help would be appreciated.