ValueError: parameters are of unsupported type

[rollbar]

View details in Rollbar: https://rollbar.com/bmordue/nb/items/29/

Traceback (most recent call last):
  File "src/app.py", line 84, in <module>
    schedule.run_pending()
  File "/home/ben/Projects/nb/.env/lib/python3.7/site-packages/schedule/__init__.py", line 563, in run_pending
    default_scheduler.run_pending()
  File "/home/ben/Projects/nb/.env/lib/python3.7/site-packages/schedule/__init__.py", line 94, in run_pending
    self._run_job(job)
  File "/home/ben/Projects/nb/.env/lib/python3.7/site-packages/schedule/__init__.py", line 147, in _run_job
    ret = job.run()
  File "/home/ben/Projects/nb/.env/lib/python3.7/site-packages/schedule/__init__.py", line 466, in run
    ret = self.job_func()
  File "src/app.py", line 37, in periodic_populate
    populate()
  File "/home/ben/Projects/nb/.env/lib/python3.7/site-packages/datadog/dogstatsd/context.py", line 53, in wrapped
    return func(*args, **kwargs)
  File "/home/ben/Projects/nb/src/tasks/populate.py", line 39, in populate
    batch = db_client.read_hashes(batch_size)
  File "/home/ben/Projects/nb/.env/lib/python3.7/site-packages/datadog/dogstatsd/context.py", line 53, in wrapped
    return func(*args, **kwargs)
  File "/home/ben/Projects/nb/src/connectors/SqliteClient.py", line 136, in read_hashes
    cursor = self.execute_wrapper(query, count)
  File "/home/ben/Projects/nb/src/connectors/SqliteClient.py", line 157, in execute_wrapper
    cursor.execute(query_str, query_params)
ValueError: parameters are of unsupported type