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This isn't really a huge issue. It is a rare case that I can fix with a try except in the canvas draw method.
I have an animation running in my PySide GUI where the plot is inside a splitter. When the user drags the splitter to hide the plot I get a constant stream of errors. Draw doesn't work when the Canvas has either width == 0 or height == 0. If there is no height, width, or the canvas is not visible then the plot shouldn't try to draw at all.
File "site-packages\matplotlib\backends\backend_qt5.py", line 338, in resizeEvent
self.draw()
File "site-packages\matplotlib\backends\backend_qt5agg.py", line 148, in draw
FigureCanvasAgg.draw(self)
File "site-packages\matplotlib\backends\backend_agg.py", line 469, in draw
self.figure.draw(self.renderer)
File "site-packages\matplotlib\artist.py", line 59, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "site-packages\matplotlib\figure.py", line 1017, in draw
self.tight_layout(renderer, **self._tight_parameters)
File "site-packages\matplotlib\figure.py", line 1663, in tight_layout
rect=rect)
File "site-packages\matplotlib\tight_layout.py", line 352, in get_tight_layout_figure
pad=pad, h_pad=h_pad, w_pad=w_pad)
File "site-packages\matplotlib\tight_layout.py", line 131, in auto_adjust_subplotpars
fig.transFigure.inverted())
File "site-packages\matplotlib\transforms.py", line 1728, in inverted
self._inverted = Affine2D(inv(mtx), shorthand_name=shorthand_name)
File "site-packages\numpy\linalg\linalg.py", line 520, in inv
ainv = _umath_linalg.inv(a, signature=signature, extobj=extobj)
File "site-packages\numpy\linalg\linalg.py", line 90, in _raise_linalgerror_singular
raise LinAlgError("Singular matrix")
LinAlgError: Singular matrixMetadata
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