It might happen that in the first round (when i is zero), d < lc * .3 and so...

It might happen that in the first round (when i is zero), d < lc * .3 and so v0 is still the begin point of the edge. If then v0->getParameter(0, t0); is called, it will always fill in t0 and return false (which is not caught here). When the edge has bounds which do not start at 0, the value of t0 is not correct. This issue is now fixed by projecting the node back on the edge if the node is on a point instead of the edge.