remapp.netdicom.qrscu.qrscu ValueError("invalid literal for int() with base 10: ''",)

I am using OpenREM 0.9.0, Python 2.7.15, Celery 3.1.25, Erlang 21.2, RabbitMQ 3.7.12 with PostgreSQL and ORTHANC. I am running the RabbitMQ admin page and Flower. On Windows 10.

Both local store and remote nodes are responding to DICOM echos.

When attempting to QR from PACS I get the following reproducible error log from celery

[2019-03-14 16:27:18,980: INFO/Worker-1] Association response received
[2019-03-14 16:28:00,773: ERROR/MainProcess] Task remapp.netdicom.qrscu.qrscu[41d0cb11-e38f-44ca-8ec4-5ad093560623] raised unexpected: ValueError("invalid literal for int() with base 10: ''",)
Traceback (most recent call last):
  File "c:\python27\lib\site-packages\celery\app\trace.py", line 240, in trace_task
    R = retval = fun(*args, **kwargs)
  File "c:\python27\lib\site-packages\celery\app\trace.py", line 438, in __protected_call__
    return self.run(*args, **kwargs)
  File "c:\python27\lib\site-packages\openrem\remapp\netdicom\qrscu.py", line 968, in qrscu
    assoc, query, all_mods, filters, get_toshiba_images)
  File "c:\python27\lib\site-packages\openrem\remapp\netdicom\qrscu.py", line 256, in _prune_series_responses
    sr_type = _check_sr_type_in_study(assoc, study, query.query_id)
  File "c:\python27\lib\site-packages\openrem\remapp\netdicom\qrscu.py", line 421, in _check_sr_type_in_study
    _query_images(assoc, sr, query_id)
  File "c:\python27\lib\site-packages\openrem\remapp\netdicom\qrscu.py", line 502, in _query_images
    imagesrsp.save()
  File "c:\python27\lib\site-packages\django\db\models\base.py", line 734, in save
    force_update=force_update, update_fields=update_fields)
  File "c:\python27\lib\site-packages\django\db\models\base.py", line 762, in save_base
    updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)
  File "c:\python27\lib\site-packages\django\db\models\base.py", line 827, in _save_table
    forced_update)
  File "c:\python27\lib\site-packages\django\db\models\base.py", line 877, in _do_update
    return filtered._update(values) > 0
  File "c:\python27\lib\site-packages\django\db\models\query.py", line 580, in _update
    return query.get_compiler(self.db).execute_sql(CURSOR)
  File "c:\python27\lib\site-packages\django\db\models\sql\compiler.py", line 1062, in execute_sql
    cursor = super(SQLUpdateCompiler, self).execute_sql(result_type)
  File "c:\python27\lib\site-packages\django\db\models\sql\compiler.py", line 829, in execute_sql
    sql, params = self.as_sql()
  File "c:\python27\lib\site-packages\django\db\models\sql\compiler.py", line 1030, in as_sql
    val = field.get_db_prep_save(val, connection=self.connection)
  File "c:\python27\lib\site-packages\django\db\models\fields\__init__.py", line 710, in get_db_prep_save
    prepared=False)
  File "c:\python27\lib\site-packages\django\db\models\fields\__init__.py", line 702, in get_db_prep_value
    value = self.get_prep_value(value)
  File "c:\python27\lib\site-packages\django\db\models\fields\__init__.py", line 1869, in get_prep_value
    return int(value)
ValueError: invalid literal for int() with base 10: ''

And this from the QR log

[14/Mar/2019 16:27:18] DEBUG [remapp.netdicom.qrscu:420] Form mods are [u'CT'], inc_sr is False
[14/Mar/2019 16:27:18] DEBUG [remapp.netdicom.qrscu:421] All form modes are {'get_toshiba_images_field': False, 'stationname_include_field': u'', 'desc_exclude_field': u'', 'date_from_field': datetime.date(2019, 3, 14), 'store_scp_field': u'2', 'stationname_exclude_field': u'', 'duplicates_field': True, 'date_until_field': datetime.date(2019, 3, 14), 'desc_include_field': u'', 'modality_field': [u'CT'], 'inc_sr_field': False, 'remote_host_field': u'1'}
[14/Mar/2019 16:27:18] INFO [remapp.netdicom.qrscu:645] 5a212c0e-8579-4667-8ed3-8c82cbe7e231: Request association with {'Port': ***, 'AET': '****', 'Address': '**.***.**.***'} (10.175.73.127 105 from <AE(ORTHANC, stopped daemon 16308)>)
[14/Mar/2019 16:27:19] INFO [remapp.netdicom.qrscu:839] 5a212c0e-8579-4667-8ed3-8c82cbe7e231 DICOM Echo ... 
[14/Mar/2019 16:27:19] INFO [remapp.netdicom.qrscu:849] 5a212c0e-8579-4667-8ed3-8c82cbe7e231 DICOM FindSCU ... 
[14/Mar/2019 16:27:19] INFO [remapp.netdicom.qrscu:691] 5a212c0e-8579-4667-8ed3-8c82cbe7e231 Currently querying for CT studies...
[14/Mar/2019 16:27:21] INFO [remapp.netdicom.qrscu:885] 5a212c0e-8579-4667-8ed3-8c82cbe7e231 86 studies returned, will now process to remove studies that are not useful.
[14/Mar/2019 16:27:21] INFO [remapp.netdicom.qrscu:914] 5a212c0e-8579-4667-8ed3-8c82cbe7e231 Pruning study responses based on inc/exc options: 
[14/Mar/2019 16:27:22] INFO [remapp.netdicom.qrscu:921] 5a212c0e-8579-4667-8ed3-8c82cbe7e231 Pruning studies based on inc/exc has removed 0 studies, 86 studies remain.
[14/Mar/2019 16:27:22] INFO [remapp.netdicom.qrscu:925] 5a212c0e-8579-4667-8ed3-8c82cbe7e231 Querying at series level to get more details about studies
[14/Mar/2019 16:28:00] INFO [remapp.netdicom.qrscu:168] 5a212c0e-8579-4667-8ed3-8c82cbe7e231 Getting series and image level information and deleting series we can't use

Thanks for your help, Rob

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