Kekspanzer

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visualizer.py", line 213, in plot_bars self.prev_screen.set_alpha(self.prev_screen.get_alpha()*self.alpha_multiplier) TypeError: unsupported operand type(s) for *: 'NoneType' and 'float'

I had the same issue. It seems like a bug from pygame. My work around was from there(https://stackoverflow.com/questions/21079360/using-surface-copy-sometimes-loses-transparency) I added .convert_alpha() to the screen.copy() definition. Then it startet working for...