CLI: IndexError: list index out of range

[yolile]

commnad: spoonbill data/uruguay-2020.json --xlsx

file: uruguay-2020.json.gz

output:

Detecting input file format
Input file is release package
No schema provided, using version 1__1__5
State file not supplied, going to analyze input file first
Processing file: data/uruguay-2020.json
  Processed 82736 objects  [############################################################################################################################################################################-------------------------------------------------------------------------------]  116654080/169554704   68%  00:01:58
Traceback (most recent call last):
  File "spoonbill", line 8, in <module>
    sys.exit(cli())
  File "click/core.py", line 1137, in __call__
    return self.main(*args, **kwargs)
  File "click/core.py", line 1062, in main
    rv = self.invoke(ctx)
  File "click/core.py", line 1404, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "click/core.py", line 763, in invoke
    return __callback(*args, **kwargs)
  File "spoonbill/cli.py", line 213, in cli
    for read, number in analyzer.analyze_file(filename, with_preview=True):
  File "spoonbill/__init__.py", line 52, in analyze_file
    for count in self.spec.process_items(items, with_preview=with_preview):
  File "spoonbill/stats.py", line 226, in process_items
    if not isinstance(item[0], dict) and not item_type:
IndexError: list index out of range