Crash happens while building a space platform. Tried several ways but keeps happening after successfully built several platforms already. Currently trying to build the 5th platform. I haven't done detailed verification, but it has occurred at least three times in this situation.

Below is the crash log.
(There may be typos)

ーーー↓
Error while running event Inter-Platform-Logistics::on_cargo_pod_delivered_cargo (ID 13)
Inter-Platform-Logistics/scripts/logistic_system.lua:299: attempt to perform arithmetic on field '?' (a nil value)
stack traceback:
Inter-Platform-Logistics/scripts/logistic_system.lua:299: in function <Inter-Platform-Logistics/scripts/logistic_system.lua:288>
ーーー↑

That concludes the crash log.

I hope this helps with the bug fixes.

Hello,
what's your modlist ?
What's the version of IPL you use ?
When you say "trying to build a space platform" what exactly were you doing ? Was the platform already built ? DId you just send the starting kit ?

BTW I do like this mod - good job I think its balanced quite well.
Sorry for the lack of info here is some more info...
Factorio version: 2.0.73
Mod Version: 1.7.3
Mod List: base, elevated-rails, quality, astroponics, belt-visualize, biolabs-in-space, bobinserters, cargo-bay-inserters, Early-3x3-Electric-Furnaces, early-circuit-network, even-pickier-dollies, FasterStart, fdsl, flib, Flow Control, hd_planets_renders, Inter-Platform-Logistics, let-me-laser-down-asteroids, load-spreader, no-more-trigger-techs, platform-construction-reader, platforms-do-not-delete-items, RateCalculator, Rocs-Improved-Platform-Drag, Sane-Concrete-2, simplified-thrusters, smooth_platform_walls, space-platform-graveyard, valves, valves-lib, visible-planets, yunrus-space-block.
All mods latest version as of a few days ago. I have not updated any mods since the start of my map.

Latest attempt: First I place the requestor antenna and connect it to the "platform construction needs radar". Platform starts building no problem.
All my constant combinators include a C=1 signal for channel on all my platforms. Not sure if that is an issue.
While the platform gets built I relocate the requestor antenna where I want it and shortly after that it crashes. Not sure if the crash happenes when moving the requestor antenna or the "platform needs construction radar".

Hope that helps. Cheers

Just saw version 1.7.5 of your mod. Updating my map now to see if it fixes my issue.

Thanks for the positive comment.
Yes when i see your crash log I suspect the latest version should not crash for you anymore.

Still crashing with the following log...

7512.715 Error MainLoop.cpp:1468: Exception at tick 16299341: The mod IPL - Inter Platform Logistics (1.7.5) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event Inter-Platform-Logistics::on_cargo_pod_delivered_cargo (ID 13)
Inter-Platform-Logistics/scripts/logistic_system.lua:300: bad argument #1 of 2 to 'next' (table expected, got nil)
stack traceback:
[C]: in function 'next'
Inter-Platform-Logistics/scripts/logistic_system.lua:300: in function <Inter-Platform-Logistics/scripts/logistic_system.lua:288>