ElmerGrid ends with segfault whennumber of partitions is greater than 2

[Ben]

Content of beam3d050.grd:
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##### ElmerGrid input file for structured grid generation ######
Version = 210903
Coordinate System = Cartesian 3D
Subcell Divisions in 3D = 1 1 1
Subcell Sizes 1 = 100.0
Subcell Sizes 2 = 10.0
Subcell Sizes 3 = 10.0
Material Structure in 2D
  1
End
Materials Interval = 1 1
Boundary Definitions
# type out int
  1 -1 1 1
  2 -2 1 1
  3 -3 1 1
  4 -4 1 1
End
Numbering = Horizontal
Element Degree = 1
Element Innernodes = False
Triangles = False
Element Ratios 1 = 1
Element Ratios 2 = 1
Element Ratios 3 = 1
Element Divisions 1 = 50
Element Divisions 2 = 5
Element Divisions 3 = 5
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