Ilastik Animal Tracking Batch Processing KeyError(1)

When I try to batch process data in my animal tracking workflow, I get the message:
Error encountered during batch processing:
KeyError(1)
My workflow works for the input data, and I can successfully export tracking results. However even if I select the same raw data .h5 and the same .h5 prediction map as my original input data for the batch processing, it throws the KeyError(1). My best guess is that my issue has something to do with no objects in the initial frames and is connected to this https://github.com/ilastik/ilastik/issues/1709#issue-295816704
If this is the case, I am unsure of why the Tracking and Tracking Result Export tabs in ilastik run with no issues with the same files.
Since I’m fairly new to working with ilastik, I may have left out relevant details which I will provide on request.

The log shows the following:

QObject::connect: Cannot queue arguments of type 'QVector<int>'
(Make sure 'QVector<int>' is registered using qRegisterMetaType().)
QObject::connect: Cannot queue arguments of type 'QVector<int>'
(Make sure 'QVector<int>' is registered using qRegisterMetaType().)
QObject::connect: Cannot queue arguments of type 'QVector<int>'
(Make sure 'QVector<int>' is registered using qRegisterMetaType().)
Object features
[                    ] 0%Detection probabilities
[                    ] 0%ERROR 2021-01-28 14:31:09,489 log_exception 5144 4940 Traceback (most recent call last):
  File "C:\Program Files\ilastik-1.3.3post3\ilastik-meta\lazyflow\lazyflow\request\request.py", line 360, in _execute
    self._result = self.fn()
  File "C:\Program Files\ilastik-1.3.3post3\ilastik-meta\ilastik\ilastik\applets\batchProcessing\batchProcessingApplet.py", line 118, in run_export
    progress_callback=partial(lerpProgressSignal, global_progress_start, global_progress_end),
  File "C:\Program Files\ilastik-1.3.3post3\ilastik-meta\ilastik\ilastik\applets\batchProcessing\batchProcessingApplet.py", line 173, in export_dataset
    self.dataExportApplet.prepare_lane_for_export(self.num_lanes - 1)
  File "C:\Program Files\ilastik-1.3.3post3\ilastik-meta\ilastik\ilastik\workflows\tracking\conservation\conservationTrackingWorkflow.py", line 382, in prepare_lane_for_export
    withBatchProcessing=True,
  File "C:\Program Files\ilastik-1.3.3post3\ilastik-meta\ilastik\ilastik\applets\tracking\conservation\opConservationTracking.py", line 517, in track
    hypothesesGraph = self._createHypothesesGraph()
  File "C:\Program Files\ilastik-1.3.3post3\ilastik-meta\ilastik\ilastik\applets\tracking\conservation\opConservationTracking.py", line 286, in _createHypothesesGraph
    with_classifier_prior=withClassifierPrior,
  File "C:\Program Files\ilastik-1.3.3post3\ilastik-meta\ilastik\ilastik\applets\tracking\conservation\opConservationTracking.py", line 812, in _generate_traxelstore
    detProbs = self.DetectionProbabilities(time_range).wait()
  File "C:\Program Files\ilastik-1.3.3post3\ilastik-meta\lazyflow\lazyflow\request\request.py", line 541, in wait
    return self._wait(timeout)
  File "C:\Program Files\ilastik-1.3.3post3\ilastik-meta\lazyflow\lazyflow\request\request.py", line 569, in _wait
    self._wait_within_request(current_request)
  File "C:\Program Files\ilastik-1.3.3post3\ilastik-meta\lazyflow\lazyflow\request\request.py", line 698, in _wait_within_request
    raise_with_traceback(exc_value, exc_tb)
  File "C:\Program Files\ilastik-1.3.3post3\lib\site-packages\future\utils\__init__.py", line 446, in raise_with_traceback
    raise exc.with_traceback(traceback)
  File "C:\Program Files\ilastik-1.3.3post3\ilastik-meta\lazyflow\lazyflow\request\request.py", line 360, in _execute
    self._result = self.fn()
  File "C:\Program Files\ilastik-1.3.3post3\ilastik-meta\lazyflow\lazyflow\slot.py", line 869, in __call__
    result_op = self.operator.call_execute(self.slot.top_level_slot, self.slot.subindex, self.roi, destination)
  File "C:\Program Files\ilastik-1.3.3post3\ilastik-meta\lazyflow\lazyflow\operator.py", line 591, in call_execute
    return self.execute(slot, subindex, roi, result, **kwargs)
  File "C:\Program Files\ilastik-1.3.3post3\ilastik-meta\ilastik\ilastik\applets\objectClassification\opObjectClassification.py", line 1282, in execute
    pool.wait()
  File "C:\Program Files\ilastik-1.3.3post3\ilastik-meta\lazyflow\lazyflow\request\request.py", line 1354, in wait
    self._clear_finishing_requests()
  File "C:\Program Files\ilastik-1.3.3post3\ilastik-meta\lazyflow\lazyflow\request\request.py", line 1449, in _clear_finishing_requests
    req.block()
  File "C:\Program Files\ilastik-1.3.3post3\ilastik-meta\lazyflow\lazyflow\request\request.py", line 547, in block
    self._wait(timeout)  # No return value. Use wait()
  File "C:\Program Files\ilastik-1.3.3post3\ilastik-meta\lazyflow\lazyflow\request\request.py", line 569, in _wait
    self._wait_within_request(current_request)
  File "C:\Program Files\ilastik-1.3.3post3\ilastik-meta\lazyflow\lazyflow\request\request.py", line 654, in _wait_within_request
    raise_with_traceback(exc_type(exc_value), exc_tb)
  File "C:\Program Files\ilastik-1.3.3post3\lib\site-packages\future\utils\__init__.py", line 446, in raise_with_traceback
    raise exc.with_traceback(traceback)
  File "C:\Program Files\ilastik-1.3.3post3\ilastik-meta\lazyflow\lazyflow\request\request.py", line 360, in _execute
    self._result = self.fn()
  File "C:\Program Files\ilastik-1.3.3post3\ilastik-meta\ilastik\ilastik\applets\objectClassification\opObjectClassification.py", line 1273, in predict_forest
    prob_predictions[_t] = classifier.predict_probabilities(feats[_t].astype(numpy.float32))
KeyError: KeyError(1)

ERROR 2021-01-28 14:31:09,495 log_exception 5144 4940 Error encountered during batch processing:
KeyError(1)