Exception in migration upload

Traceback (most recent call last):
  File "/nomad/u/mscheidg/Documents/Projects/nomad/3-git/nomad-FAIR/nomad/migration.py", line 875, in migrate_package
    package_report = self.migrate_package(package, delete_failed=delete_failed, republish=republish)
  File "/nomad/u/mscheidg/Documents/Projects/nomad/3-git/nomad-FAIR/nomad/migration.py", line 1194, in migrate_package
    for _, source_calc_with_metadata in source_calcs.values()]
  File "/nomad/u/mscheidg/Documents/Projects/nomad/3-git/nomad-FAIR/nomad/migration.py", line 1194, in <listcomp>
    for _, source_calc_with_metadata in source_calcs.values()]
  File "/nomad/u/mscheidg/Documents/Projects/nomad/3-git/nomad-FAIR/nomad/migration.py", line 1248, in _to_api_metadata
    _name=ds.get('name', None)) for ds in calc_with_metadata.datasets],
  File "/nomad/u/mscheidg/Documents/Projects/nomad/3-git/nomad-FAIR/nomad/migration.py", line 1248, in <listcomp>
    _name=ds.get('name', None)) for ds in calc_with_metadata.datasets],
TypeError: 'NoneType' object is not subscriptable

{
  "_index": "logstash-2019.05.07",
  "_type": "doc",
  "_id": "ooXfkGoB0XR4BDyb_E7L",
  "_version": 1,
  "_score": null,
  "_source": {
    "event": "unexpected exception while migrating packages",
    "logger_name": "nomad.migration",
    "nomad.migration.package_id": "_ttAlUeOSDyKXf2ZvPNVFQ",
    "level": "ERROR",
    "host": "nomad-flink-01",
    "type": "Logstash",
    "path": "/nomad/u/mscheidg/Documents/Projects/nomad/3-git/nomad-FAIR/nomad/migration.py",
    "@timestamp": "2019-05-07T05:59:19.396Z",
    "@version": "1",
    "nomad.migration.migration_version": 8,
    "nomad.service": "client",
    "stack_info": null,
    "port": 47934,
    "message": "unexpected exception while migrating packages",
    "digest": "_metadata.datasets],\n  File \"/nomad/u/mscheidg/Documents/Projects/nomad/3-git/nomad-FAIR/nomad/migration.py\", line 1248, in <listcomp>\n    _name=ds.get('name', None)) for ds in calc_with_metadata.datasets],\nTypeError: 'NoneType' object is not subscriptable",
    "tags": [
      "nomad",
      "devel"
    ],
    "exception": "Traceback (most recent call last):\n  File \"/nomad/u/mscheidg/Documents/Projects/nomad/3-git/nomad-FAIR/nomad/migration.py\", line 875, in migrate_package\n    package_report = self.migrate_package(package, delete_failed=delete_failed, republish=republish)\n  File \"/nomad/u/mscheidg/Documents/Projects/nomad/3-git/nomad-FAIR/nomad/migration.py\", line 1194, in migrate_package\n    for _, source_calc_with_metadata in source_calcs.values()]\n  File \"/nomad/u/mscheidg/Documents/Projects/nomad/3-git/nomad-FAIR/nomad/migration.py\", line 1194, in <listcomp>\n    for _, source_calc_with_metadata in source_calcs.values()]\n  File \"/nomad/u/mscheidg/Documents/Projects/nomad/3-git/nomad-FAIR/nomad/migration.py\", line 1248, in _to_api_metadata\n    _name=ds.get('name', None)) for ds in calc_with_metadata.datasets],\n  File \"/nomad/u/mscheidg/Documents/Projects/nomad/3-git/nomad-FAIR/nomad/migration.py\", line 1248, in <listcomp>\n    _name=ds.get('name', None)) for ds in calc_with_metadata.datasets],\nTypeError: 'NoneType' object is not subscriptable",
    "nomad.migration.source_upload_id": "uiByHdhTkP0PJOya9Im7odCoX-ZEy06D6cy0V7QFI",
    "nomad.release": "devel"
  },
  "fields": {
    "@timestamp": [
      "2019-05-07T05:59:19.396Z"
    ]
  },
  "highlight": {
    "nomad.service.keyword": [
      "@kibana-highlighted-field@client@/kibana-highlighted-field@"
    ],
    "level.keyword": [
      "@kibana-highlighted-field@ERROR@/kibana-highlighted-field@"
    ]
  },
  "sort": [
    1557208759396
  ]
}