ValueError: zero-size array to reduction operation minimum which has no identity

Bug report

Traceback (most recent call last):
  File "C:\Program Files\Python37\lib\site-packages\matplotlib\backends\backend_qt5agg.py", line 58, in paintEvent
    memoryview(reg))
  File "C:\Program Files\Python37\lib\site-packages\matplotlib\cbook\__init__.py", line 2116, in _unmultiplied_rgba8888_to_premultiplied_argb32
    if alpha8.min() != 0xff:
  File "C:\Program Files\Python37\lib\site-packages\numpy\core\_methods.py", line 34, in _amin
    return umr_minimum(a, axis, None, out, keepdims, initial, where)
ValueError: zero-size array to reduction operation minimum which has no identity

I created some matplotlib images and impeded them in pyqt5 application. when scrolling up and down with the mouse at the window where the images are my app crashes and I do not know which line of code causing the crash.

Code for reproduction

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Actual outcome

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Expected outcome

Matplotlib version

  • Operating system: Windows 10 64bit
  • Matplotlib version: 3.1.2
  • Matplotlib backend (print(matplotlib.get_backend())):
  • Python version: ‘3.7.6 (tags/v3.7.6:43364a7ae0, Dec 19 2019, 00:42:30) [MSC v.1916 64 bit (AMD64)]’
  • Jupyter version (if applicable): No jupyter or ipython
  • Other libraries:
    C:\Users\asalh>pip list
    Package Version

altgraph 0.17
cycler 0.10.0
future 0.18.2
kiwisolver 1.1.0
matplotlib 3.1.2
numpy 1.18.1
pandas 0.25.3
pefile 2019.4.18
pip 19.3.1
PyInstaller 3.6
pyparsing 2.4.6
PyQt5 5.14.1
PyQt5-sip 12.7.0
python-dateutil 2.8.1
pytz 2019.3
pywin32-ctypes 0.2.0
setuptools 41.2.0
six 1.14.0
xlrd 1.2.0

pip

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