System.InvalidOperationException: Can't begin hex move while another in progress is the important part from the logs.
I have a slight recollection that something was done about this recently. It seems like this might be a bug where you manage to activate the move action multiple times during the same game update leading to the game detecting a move action starting while another has already started (which is normally prevented as the GUI won’t let you do this kind of incorrect thing). On Linux/Windows this turned out to be extremely difficult to trigger even when intentionally trying, but anyway this should be fully fixed in the next release thanks to this pretty recent change: