formula autocomplete: tuple index out of range

[tschaume]

/materials/formula_autocomplete

builtins.IndexError: tuple index out of range
Traceback (most recent call last):
  File "/root/.local/lib/python3.9/site-packages/ddtrace/contrib/asgi/middleware.py", line 173, in __call__
    return await self.app(scope, receive, wrapped_send)
  File "/root/.local/lib/python3.9/site-packages/starlette/exceptions.py", line 82, in __call__
    raise exc
  File "/root/.local/lib/python3.9/site-packages/starlette/exceptions.py", line 71, in __call__
    await self.app(scope, receive, sender)
  File "/root/.local/lib/python3.9/site-packages/starlette/routing.py", line 656, in __call__
    await route.handle(scope, receive, send)
  File "/root/.local/lib/python3.9/site-packages/starlette/routing.py", line 259, in handle
    await self.app(scope, receive, send)
  File "/root/.local/lib/python3.9/site-packages/starlette/routing.py", line 61, in app
    response = await func(request)
  File "/root/.local/lib/python3.9/site-packages/fastapi/routing.py", line 216, in app
    solved_result = await solve_dependencies(
  File "/root/.local/lib/python3.9/site-packages/fastapi/dependencies/utils.py", line 527, in solve_dependencies
    solved = await run_in_threadpool(call, **sub_values)
  File "/root/.local/lib/python3.9/site-packages/starlette/concurrency.py", line 39, in run_in_threadpool
    return await anyio.to_thread.run_sync(func, *args)
  File "/root/.local/lib/python3.9/site-packages/anyio/to_thread.py", line 28, in run_sync
    return await get_asynclib().run_sync_in_worker_thread(func, *args, cancellable=cancellable,
  File "/root/.local/lib/python3.9/site-packages/anyio/_backends/_asyncio.py", line 818, in run_sync_in_worker_thread
    return await future
  File "/root/.local/lib/python3.9/site-packages/anyio/_backends/_asyncio.py", line 754, in run
    result = context.run(func, *args)
  File "/emmet-api/emmet/api/routes/materials/query_operators.py", line 360, in query
    comp_red = comp.reduced_composition.items()
  File "/root/.local/lib/python3.9/site-packages/pymatgen/core/composition.py", line 349, in reduced_composition
    return self.get_reduced_composition_and_factor()[0]
  File "/root/.local/lib/python3.9/site-packages/pymatgen/core/composition.py", line 359, in get_reduced_composition_and_factor
    factor = self.get_reduced_formula_and_factor()[1]
  File "/root/.local/lib/python3.9/site-packages/pymatgen/core/composition.py", line 384, in get_reduced_formula_and_factor
    (formula, factor) = reduce_formula(d, iupac_ordering=iupac_ordering)
  File "/root/.local/lib/python3.9/site-packages/pymatgen/core/composition.py", line 1183, in reduce_formula
    factor = abs(gcd(*(int(i) for i in sym_amt.values())))
  File "/root/.local/lib/python3.9/site-packages/monty/fractions.py", line 17, in gcd
    n = numbers[0]
IndexError: tuple index out of range