Error while running event level::on_gui_click (ID 1)
__level__/control.lua:4052: attempt to index local 'temp2' (a nil value) stack traceback:
_level__/control.lua:4052: in function 'CalcDistToRailhead'
_level__/control.lua:4 100: in function 'ExtendLine'
level__/control.lua:3832: in function 'extend_open_ended_rails'
_level__/control.lua:2928: in function 'intersectionplacingetc'
_level__/control.lua:299: in function <__level__/control.lua:254>

Can you give me a blueprint link?

It was a t junction that had input directions of:

^v^v (alternating)

I'll see if I can recreate it

I redid the 2.0 conversion so you can't get that exact error anymore.