You attempt to load v2.81, but the oldest release now available is
v2.140.
In v2.81 it was legal to remove nonexistent overlays, but in v2.140 it
isn't.
What happens is that if the user creates a sand trap with 6 points, you
add a 7th point to the polygon and to your array, but there's still only
the six markers that the user has created. The code in addClosing()
attempts to remove 7 markers, one for each point in the array.
for (var n = 0 ; n < routePoints[lineIx].length ; n++ ) {
map.removeOverlay(routeMarkers[lineIx][n]);
}
but the extra point that you added to close the polygon doesn't have a
marker, and the attempt to remove it crashes.
--
Mike Williams
http://econym.org.uk/gmap
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