ArgumentOutOfRangeException in Line Cast API?

General Recast graph
6

My problem posted “Linecast on Recast graph with Links. Exception!”
Might be of the same kind, as this one. It also throws exception on line Vector3 a = left[0]

					if (!node.GetPortal(node.connections[i].node, left, right, false)) continue;

					Vector3 a = left[0];
					Vector3 b = right[0];

					//i.e Left or colinear
					if (!VectorMath.RightXZ(a, b, hit.origin)) {
						if (VectorMath.RightXZ(a, b, tmp_end)) {
							//Since polygons are laid out in clockwise order, the ray would intersect (if intersecting) this edge going in to the node, not going out from it
							continue;
						}
					}