`spam-ereg` crashes when pressing ``flip`` button
File "/lib/python3.7/site-packages/spam/visual/visualClass.py", line 1151, in flip self.images[2] = numpy.flip(self.images[2], 0) IndexError: list index out of range Abandon
File "/lib/python3.7/site-packages/spam/visual/visualClass.py", line 1151, in flip self.images[2] = numpy.flip(self.images[2], 0) IndexError: list index out of range Abandon