matplotlib gives error because of wrong backend

[PaulGoslawski]

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-- elegant_summary:kuske/bessy3_5ba-20p_v_long-bend-tgrb
.  elegant_summary:hwang/bessy3_4sexts_v_1
TaskError - taskid:elegant_summary:hwang/bessy3_4sexts_v_1
PythonAction Error
Traceback (most recent call last):
  File "/net/home/jvl/.cache/pypoetry/virtualenvs/scripts-lTF_g5QG-py3.8/lib/python3.8/site-packages/doit/action.py", line 437, in execute
    returned_value = self.py_callable(*self.args, **kwargs)
  File "/net/home/jvl/nobeam/lattice-summaries-data/scripts/data_elegant.py", line 25, in results
    twiss_plot(twiss_data).savefig(output_dir / "twiss.svg")
  File "/net/home/jvl/nobeam/lattice-summaries-data/scripts/data_elegant.py", line 92, in twiss_plot
    fig, ax = plt.subplots(figsize=FIG_SIZE)
  File "/net/home/jvl/.cache/pypoetry/virtualenvs/scripts-lTF_g5QG-py3.8/lib/python3.8/site-packages/matplotlib/cbook/deprecation.py", line 451, in wrapper
    return func(*args, **kwargs)
  File "/net/home/jvl/.cache/pypoetry/virtualenvs/scripts-lTF_g5QG-py3.8/lib/python3.8/site-packages/matplotlib/pyplot.py", line 1287, in subplots
    fig = figure(**fig_kw)
  File "/net/home/jvl/.cache/pypoetry/virtualenvs/scripts-lTF_g5QG-py3.8/lib/python3.8/site-packages/matplotlib/pyplot.py", line 687, in figure
    figManager = new_figure_manager(num, figsize=figsize,
  File "/net/home/jvl/.cache/pypoetry/virtualenvs/scripts-lTF_g5QG-py3.8/lib/python3.8/site-packages/matplotlib/pyplot.py", line 315, in new_figure_manager
    return _backend_mod.new_figure_manager(*args, **kwargs)
  File "/net/home/jvl/.cache/pypoetry/virtualenvs/scripts-lTF_g5QG-py3.8/lib/python3.8/site-packages/matplotlib/backend_bases.py", line 3494, in new_figure_manager
    return cls.new_figure_manager_given_figure(num, fig)
  File "/net/home/jvl/.cache/pypoetry/virtualenvs/scripts-lTF_g5QG-py3.8/lib/python3.8/site-packages/matplotlib/backends/_backend_tk.py", line 885, in new_figure_manager_given_figure
    window = tk.Tk(className="matplotlib")
  File "/net/home/jvl/miniconda3/lib/python3.8/tkinter/__init__.py", line 2261, in __init__
    self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)
_tkinter.TclError: couldn't connect to display ":0.0"

Current workaround:

MPLBACKEND=SVG poetry run doit