Not sure how relevant this is, but currently this is incompatible with Lunar Landings.

I had this mod enabled starting on my Lunar Landings run and it worked as expected until I unlocked Luna and was about to look at the moon.
So I'm guessing something went wrong when it tried to place a Spidertron in space as the moon entities were populated?

Haven't tried it since, as I researched the spiderlings by now and make due with them instead.

The mod Start With Spidertron (1.3.2) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event ProtoSpidertron::on_nth_tick(3678306)
ProtoSpidertron/control.lua:231: attempt to index global 'event' (a nil value)
stack traceback:
ProtoSpidertron/control.lua:231: in function <ProtoSpidertron/control.lua:230>

Yeah it's probably some bad interaction when trying to load a new surface. I can take a look this weekend but no timeframe on a fix yet.

1.3.3 has an attempted fix included, let me know if that at least gets it working

Still crashes on pressing N for swap of surface; tried from Luna to Nauvis on my latest save and the other direction from an old save just after unlocking Luna.

The mod Start With Spidertron (1.3.3) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event ProtoSpidertron::on_nth_tick(43715176)
ProtoSpidertron/control.lua:231: bad argument #2 of 2 to 'get_player' (string expected, got nil)
stack traceback:
[C]: in function 'get_player'
ProtoSpidertron/control.lua:231: in function <ProtoSpidertron/control.lua:230>

I think this is the same crash I get on Space Exploration (see other thread)
If you want to get rid of the crash in the meantime, you can comment out that function on line 230 of the control.lua. It doesn't seem to impact the rest of the mod very much and you can play as you want.

Yep they are essentially the same root issue. I just made a post in the other thread. tl;dr I'll try to get another stab at a fix out this weekend, thanks for being patient with me, y'all are the best.