Changing Matplotlib Backend crashes debug mode

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It seems like nobody had this problem before: When running the following code lines in DEBUG mode, my python crashes. I'm using python 2.7 with PyCharm 2016.3.

import matplotlib
matplotlib.use("qt4agg")
from matplotlib import pyplot as plt

If I run stepwise, it works. But if I set the breakpoint after this block, matplotlib.use() and import pyplot seem to get in each other's way. Does anyone know the problem?

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