Error when uploading spectrum

[moira-andrews]

When trying to upload a spectrum, I got the following error:

snex2_1     | 2025-09-18T16:29:39.937839069Z 2025-09-18 16:29:39.898    ERROR:             log: Internal Server Error: /custom-data-upload/
snex2_1     | 2025-09-18T16:29:39.937891034Z Traceback (most recent call last):
snex2_1     | 2025-09-18T16:29:39.937895144Z   File "/usr/local/lib/python3.9/site-packages/django/db/models/fields/__init__.py", line 2055, in get_prep_value
snex2_1     | 2025-09-18T16:29:39.937898841Z     return int(value)
snex2_1     | 2025-09-18T16:29:39.937901632Z ValueError: invalid literal for int() with base 10: ''
snex2_1     | 2025-09-18T16:29:39.937904369Z 
snex2_1     | 2025-09-18T16:29:39.937907016Z The above exception was the direct cause of the following exception:
snex2_1     | 2025-09-18T16:29:39.937909872Z 
snex2_1     | 2025-09-18T16:29:39.937912478Z Traceback (most recent call last):
snex2_1     | 2025-09-18T16:29:39.937915056Z   File "/usr/local/lib/python3.9/site-packages/django/core/handlers/exception.py", line 55, in inner
snex2_1     | 2025-09-18T16:29:39.937931165Z     response = get_response(request)
snex2_1     | 2025-09-18T16:29:39.937934401Z   File "/usr/local/lib/python3.9/site-packages/django/core/handlers/base.py", line 199, in _get_response
snex2_1     | 2025-09-18T16:29:39.937937193Z     response = self.process_exception_by_middleware(e, request)
snex2_1     | 2025-09-18T16:29:39.937940040Z   File "/usr/local/lib/python3.9/site-packages/django/core/handlers/base.py", line 362, in process_exception_by_middleware
snex2_1     | 2025-09-18T16:29:39.937943253Z     response = middleware_method(request, exception)
snex2_1     | 2025-09-18T16:29:39.937945958Z   File "/usr/local/lib/python3.9/site-packages/tom_common/middleware.py", line 29, in process_exception
snex2_1     | 2025-09-18T16:29:39.937963479Z     raise exception
snex2_1     | 2025-09-18T16:29:39.937966635Z   File "/usr/local/lib/python3.9/site-packages/django/core/handlers/base.py", line 197, in _get_response
snex2_1     | 2025-09-18T16:29:39.937969409Z     response = wrapped_callback(request, *callback_args, **callback_kwargs)
snex2_1     | 2025-09-18T16:29:39.938011776Z   File "/usr/local/lib/python3.9/site-packages/django/views/generic/base.py", line 104, in view
snex2_1     | 2025-09-18T16:29:39.938024486Z     return self.dispatch(request, *args, **kwargs)
snex2_1     | 2025-09-18T16:29:39.938027430Z   File "/usr/local/lib/python3.9/site-packages/django/contrib/auth/mixins.py", line 73, in dispatch
snex2_1     | 2025-09-18T16:29:39.938030138Z     return super().dispatch(request, *args, **kwargs)
snex2_1     | 2025-09-18T16:29:39.938032657Z   File "/usr/local/lib/python3.9/site-packages/django/views/generic/base.py", line 143, in dispatch
snex2_1     | 2025-09-18T16:29:39.938035495Z     return handler(request, *args, **kwargs)
snex2_1     | 2025-09-18T16:29:39.938038167Z   File "/usr/local/lib/python3.9/site-packages/django/views/generic/edit.py", line 151, in post
snex2_1     | 2025-09-18T16:29:39.938040927Z     form = self.get_form()
snex2_1     | 2025-09-18T16:29:39.938043542Z   File "/usr/local/lib/python3.9/site-packages/tom_dataproducts/views.py", line 178, in get_form
snex2_1     | 2025-09-18T16:29:39.938046232Z     form = super().get_form(*args, **kwargs)
snex2_1     | 2025-09-18T16:29:39.938048837Z   File "/usr/local/lib/python3.9/site-packages/django/views/generic/edit.py", line 39, in get_form
snex2_1     | 2025-09-18T16:29:39.938053144Z     return form_class(**self.get_form_kwargs())
snex2_1     | 2025-09-18T16:29:39.938055707Z   File "/snex2/custom_code/forms.py", line 275, in __init__
snex2_1     | 2025-09-18T16:29:39.938058415Z     self.fields['used_in'] = forms.ModelChoiceField(queryset=Papers.objects.filter(target=target), required=False)
snex2_1     | 2025-09-18T16:29:39.938061207Z   File "/usr/local/lib/python3.9/site-packages/django/db/models/manager.py", line 87, in manager_method
snex2_1     | 2025-09-18T16:29:39.938064152Z     return getattr(self.get_queryset(), name)(*args, **kwargs)
snex2_1     | 2025-09-18T16:29:39.938066837Z   File "/usr/local/lib/python3.9/site-packages/django/db/models/query.py", line 1436, in filter
snex2_1     | 2025-09-18T16:29:39.938069617Z     return self._filter_or_exclude(False, args, kwargs)
snex2_1     | 2025-09-18T16:29:39.938072076Z   File "/usr/local/lib/python3.9/site-packages/django/db/models/query.py", line 1454, in _filter_or_exclude
snex2_1     | 2025-09-18T16:29:39.938074707Z     clone._filter_or_exclude_inplace(negate, args, kwargs)
snex2_1     | 2025-09-18T16:29:39.938082141Z   File "/usr/local/lib/python3.9/site-packages/django/db/models/query.py", line 1461, in _filter_or_exclude_inplace
snex2_1     | 2025-09-18T16:29:39.938115785Z     self._query.add_q(Q(*args, **kwargs))
snex2_1     | 2025-09-18T16:29:39.938118988Z   File "/usr/local/lib/python3.9/site-packages/django/db/models/sql/query.py", line 1498, in add_q
snex2_1     | 2025-09-18T16:29:39.938121850Z     clause, _ = self._add_q(q_object, self.used_aliases)
snex2_1     | 2025-09-18T16:29:39.938124308Z   File "/usr/local/lib/python3.9/site-packages/django/db/models/sql/query.py", line 1529, in _add_q
snex2_1     | 2025-09-18T16:29:39.938131289Z     child_clause, needed_inner = self.build_filter(
snex2_1     | 2025-09-18T16:29:39.938133924Z   File "/usr/local/lib/python3.9/site-packages/django/db/models/sql/query.py", line 1444, in build_filter
snex2_1     | 2025-09-18T16:29:39.938136767Z     condition = self.build_lookup(lookups, col, value)
snex2_1     | 2025-09-18T16:29:39.938139239Z   File "/usr/local/lib/python3.9/site-packages/django/db/models/sql/query.py", line 1271, in build_lookup
snex2_1     | 2025-09-18T16:29:39.938141847Z     lookup = lookup_class(lhs, rhs)
snex2_1     | 2025-09-18T16:29:39.938144399Z   File "/usr/local/lib/python3.9/site-packages/django/db/models/lookups.py", line 27, in __init__
snex2_1     | 2025-09-18T16:29:39.938147082Z     self.rhs = self.get_prep_lookup()
snex2_1     | 2025-09-18T16:29:39.938149519Z   File "/usr/local/lib/python3.9/site-packages/django/db/models/fields/related_lookups.py", line 166, in get_prep_lookup
snex2_1     | 2025-09-18T16:29:39.938152352Z     self.rhs = target_field.get_prep_value(self.rhs)
snex2_1     | 2025-09-18T16:29:39.938154821Z   File "/usr/local/lib/python3.9/site-packages/django/db/models/fields/__init__.py", line 2057, in get_prep_value
snex2_1     | 2025-09-18T16:29:39.938157512Z     raise e.__class__(
snex2_1     | 2025-09-18T16:29:39.938160061Z ValueError: Field 'id' expected a number but got ''.

The spectrum is a wavelength flux ascii file with the following instrument information:
Instrument: LRS2
Reducer: Greg Zreimann
Telescope: HET
Exp Time: 3600
Date observed: 2025-09-09 07:32:36
Slit (IFU, but put 1 and it failed)