QThread: Destroyed while thread is still running

I ran into this while playing around with the time axis tick string representation in the merge request. It appears to be random. I'm not sure it is related to the changes I made. It's not immediately reproducible.

/usr/lib/python3/dist-packages/pyqtgraph/graphicsItems/PlotCurveItem.py:131: RuntimeWarning: All-NaN slice encountered
  b = (np.nanmin(d), np.nanmax(d))
QThread: Destroyed while thread is still running
Aborted

Edited Feb 24, 2021 by Jameson Rollins

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