File "/reg/neh/operator/amoopr/amo87215/hummingbird/src/interface/gui.py", line 209, in _replot
p.replot()
File "/reg/neh/operator/amoopr/amo87215/hummingbird/src/interface/ui/plot_window.py", line 287, in replot
xmins.append(x.min())
File "/reg/neh/home/benedikt/.local/lib/python2.7/site-packages/numpy/core/_methods.py", line 29, in _amin
return umr_minimum(a, axis, None, out, keepdims)
ValueError: zero-size array to reduction operation minimum which has no identity