There was another crash while traveling between regular big power poles, I think this happens when the controlled character is changed by mods like Space Exploration's Navigation Satellite

Error while running event RenaiTransportation::on_nth_tick(1)
RenaiTransportation/control.lua:868: attempt to index field 'character' (a nil value)
stack traceback:
RenaiTransportation/control.lua:868: in function <RenaiTransportation/control.lua:820>

Interesting, I've never played far into space exploration but yeah if there's ever a case where control over the ziplining character changes i can see how it would crash. Also I'll just reply here since there's two posts, the crash with the power switch is because I completely forgot that was a possibility for connections, I'll have to add a check to make those compatible or ignored

No problem, and thank you for your work! :)

So I changed it so that people can't get onto a zipline if they don't have a character they are controlling, this helps prevent the situation from happening, but doesn't quite fix crashes where you change/disassociate your character while ziplining. I'll have to see how to accomidate that in the future