Error while running event aai-programmable-vehicles::on_tick (ID 0)
The mod Rampant (3.2.0) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event Rampant::on_unit_group_finished_gathering (ID 141)
Rampant/control.lua:861: attempt to index local 'chunk' (a number value)
stack traceback:
Rampant/control.lua:861: in function <Rampant/control.lua:803>
stack traceback:
[C]: in function 'start_moving'
aai-programmable-vehicles/control.lua:2424: in function 'unit_update_state'
aai-programmable-vehicles/control.lua:3336: in function 'unit_tick'
aai-programmable-vehicles/control.lua:3373: in function 'callback'
aai-programmable-vehicles/scripts/event.lua:14: in function <aai-programmable-vehicles/scripts/event.lua:12>

This is the bug report, I've sent it to AAI vehicles as well, I've got most of the AAI suite as well as space exploration. It consistently occurs when bugs get in fights with the warden, but I'm not sure what the exact trigger is.

They directed me your way

I posted my save on the linked forum post but needs to be approved. My mod list is as follows:

{
"mods":
[

{
  "name": "base",
  "enabled": true
},

{
  "name": "aai-containers",
  "enabled": true
},

{
  "name": "aai-industry",
  "enabled": true
},

{
  "name": "aai-programmable-structures",
  "enabled": true
},

{
  "name": "aai-programmable-vehicles",
  "enabled": true
},

{
  "name": "aai-signal-transmission",
  "enabled": true
},

{
  "name": "aai-signals",
  "enabled": true
},

{
  "name": "aai-vehicles-chaingunner",
  "enabled": true
},

{
  "name": "aai-vehicles-flame-tank",
  "enabled": true
},

{
  "name": "aai-vehicles-flame-tumbler",
  "enabled": true
},

{
  "name": "aai-vehicles-hauler",
  "enabled": true
},

{
  "name": "aai-vehicles-ironclad",
  "enabled": true
},

{
  "name": "aai-vehicles-laser-tank",
  "enabled": true
},

{
  "name": "aai-vehicles-miner",
  "enabled": true
},

{
  "name": "aai-vehicles-warden",
  "enabled": true
},

{
  "name": "aai-zones",
  "enabled": true
},

{
  "name": "alien-biomes",
  "enabled": true
},

{
  "name": "bullet-trails",
  "enabled": true
},

{
  "name": "Cold_biters",
  "enabled": true
},

{
  "name": "combat-mechanics-overhaul",
  "enabled": true
},

{
  "name": "DragonIndustries",
  "enabled": true
},

{
  "name": "equipment-gantry",
  "enabled": true
},

{
  "name": "Explosive_biters",
  "enabled": true
},

{
  "name": "flib",
  "enabled": true
},

{
  "name": "Geothermal",
  "enabled": true
},

{
  "name": "grappling-gun",
  "enabled": true
},

{
  "name": "informatron",
  "enabled": true
},

{
  "name": "jetpack",
  "enabled": true
},

{
  "name": "light-overhaul",
  "enabled": true
},

{
  "name": "Milestones",
  "enabled": true
},

{
  "name": "ModuleInserterSimplified",
  "enabled": true
},

{
  "name": "Rampant",
  "enabled": true
},

{
  "name": "robot_attrition",
  "enabled": true
},

{
  "name": "shield-projector",
  "enabled": true
},

{
  "name": "simhelper",
  "enabled": true
},

{
  "name": "space-exploration",
  "enabled": true
},

{
  "name": "space-exploration-graphics",
  "enabled": true
},

{
  "name": "space-exploration-graphics-2",
  "enabled": true
},

{
  "name": "space-exploration-graphics-3",
  "enabled": true
},

{
  "name": "space-exploration-graphics-4",
  "enabled": true
},

{
  "name": "space-exploration-graphics-5",
  "enabled": true
},

{
  "name": "space-exploration-menu-simulations",
  "enabled": true
},

{
  "name": "space-exploration-official-modpack",
  "enabled": true
},

{
  "name": "space-exploration-postprocess",
  "enabled": true
},

{
  "name": "textplates",
  "enabled": true
}

]
}

Tried it on 3.2.2 and I still get the same error

I found the same error on 3.2.2 version. It's happening, when any programmable vehicle coming close to the group of bitter. AAI Programmable vehicles also installed.

Ok save has been uploaded to linked forum post by ThePerfectLink

Should be fixed in the latest.

Should be fixed in the latest.

Yes. Fixed! Great thanks!

Excellent, thanks!