Any model. A simple cube is already enough.

First of all, thanks for the amazing plugins that you provide to the community!

For some reason, I am experiencing errors with the Round Push-Pull tool. This happens in SU 2017 and SU 2018 alike. Every time I am trying to apply the function, the following error message appears. I have the latest versions of the LibFredo6 (8.7) and Fredo6 JointPushPull (4.4b) installed on a Windows10 machine with the latest drivers for my NVIDIA 960 GPU's. Any idea?

Date: 13-Jan-19 09:26:04
An error occurred in Round Push Pull
Error in Analysis of model

Cannot create unit vector from zero length vector

body_lib6g6.rbe: 1863 -- intersect_plane_plane
body_lib6g6.rbe: 1863 -- vector_exact_average
jointpushpullalgo.rbe: 1445 -- block (2 levels) in round_compute_direction
jointpushpullalgo.rbe: 1433 -- each
jointpushpullalgo.rbe: 1433 -- block in round_compute_direction
jointpushpullalgo.rbe: 1415 -- each
jointpushpullalgo.rbe: 1415 -- round_compute_direction
jointpushpullalgo.rbe: 1353 -- block in block_prepare_vertices_R
jointpushpullalgo.rbe: 1353 -- each
jointpushpullalgo.rbe: 1353 -- block_prepare_vertices_R
jointpushpullalgo.rbe: 1111 -- block in block_prepare_vertices_all
jointpushpullalgo.rbe: 1111 -- each
jointpushpullalgo.rbe: 1111 -- block_prepare_vertices_all
jointpushpullalgo.rbe: 519 -- algo_prepare_calculation_exec
jointpushpullalgo.rbe: 499 -- algo_prepare_calculation
jointpushpulltool.rbe: 826 -- dragging_start
jointpushpulltool.rbe: 1516 -- onLButtonDown