JSONDecodeError: Expecting ',' delimiter: line 1 column 359 (char 358)

[sentry]

Sentry Issue: SPEID-PROD-DW

JSONDecodeError: Expecting ',' delimiter: line 1 column 359 (char 358)
(6 additional frame(s) were not displayed)
...
  File "newrelic/hooks/framework_flask.py", line 194, in _nr_wrapper_Flask_before_request_wrapped_
    return wrapped(*args, **kwargs)
  File "speid/views.py", line 69, in log_posts
    data = json.loads(data)
  File "__init__.py", line 348, in loads
    return _default_decoder.decode(s)
  File "json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "json/decoder.py", line 353, in raw_decode
    obj, end = self.scan_once(s, idx)