Running icon action is producing an exception

[finetjul]

When I click on

as first action after loading the application, I got the following exception:

Exception raised
ValueError('zero-size array to reduction operation minimum which has no identity')
Traceback (most recent call last):
  File "/home/julien/Work/trame/conceptual-modeler/env39/lib/python3.9/site-packages/wslink/protocol.py", line 332, in onMessage
    results = func(*args, **kwargs)
  File "/home/julien/Work/trame/conceptual-modeler/env39/lib/python3.9/site-packages/trame_server/protocol.py", line 210, in update_state
    self.server.state.update(client_state)
  File "/home/julien/Work/trame/conceptual-modeler/env39/lib/python3.9/site-packages/trame_server/state.py", line 268, in __exit__
    self.flush()
  File "/home/julien/Work/trame/conceptual-modeler/env39/lib/python3.9/site-packages/trame_server/state.py", line 246, in flush
    coroutine = callback(**self._pushed_state)
  File "/home/julien/Work/trame/conceptual-modeler/conceptual_modeler/app/engine.py", line 252, in compute
    ctrl.compute_geo_model()
  File "/home/julien/Work/trame/conceptual-modeler/env39/lib/python3.9/site-packages/trame_server/controller.py", line 334, in __call__
    result = f(*args, **kwargs)
  File "/home/julien/Work/trame/conceptual-modeler/conceptual_modeler/app/modeler/subsurface.py", line 1427, in compute_geo_model
    gp.compute_model(self._geo_model)
  File "/home/julien/Work/trame/conceptual-modeler/env39/lib/python3.9/site-packages/gempy/gempy_api.py", line 277, in compute_model
    _check_valid_model_input(model)
  File "/home/julien/Work/trame/conceptual-modeler/env39/lib/python3.9/site-packages/gempy/gempy_api.py", line 313, in _check_valid_model_input
    if model._additional_data.structure_data.df.loc[
  File "/home/julien/Work/trame/conceptual-modeler/env39/lib/python3.9/site-packages/numpy/core/_methods.py", line 44, in _amin
    return umr_minimum(a, axis, None, out, keepdims, initial, where)
ValueError: zero-size array to reduction operation minimum which has no identity