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The following error occurs in crossover:

How to reproduce:

is_closed = True
geometry = Geometry2D(is_closed=is_closed)
domain = Domain(allowed_area=[(0, 0),
                              (0, 300),
                              (300, 300),
                              (300, 0),
                              (0, 0)],
                geometry=geometry,
                max_poly_num=20,
                min_poly_num=1,
                max_points_num=20,
                min_points_num=5,
                is_closed=is_closed)

task_setup = Setup(domain=domain)

# Optimizing stage
start = timeit.default_timer()
optimized_structure = optimize(task_setup=task_setup,
                               objective_function=partial(multi_loss,
                                                          expected_poly_num=expected_poly_num),
                               pop_size=100,
                               max_gens=100)

Note:

bug occurs more frequently if max_poly_num is large.