Failed to load mods: _quality-heat-pipes /data-final-fixes.lua:20: attempt to perform arithmetic on field 'max_health' (a nil value)
stack traceback:
quality-heat-pipes __ /data-final-fixes.lua:20: in main chunk

Mods to be disabled:
· quality-heat-pipes (1.1.1)

What mods do you have enabled? I cannot seem to replicate this on my end. Nor do I understand how this error could come to be with how things are right now, other than other mod compatibility issues.

oof, I run...a fair few. From the most recent factorio-current.log:
3.223 Loading mod core 0.0.0 (data.lua)
3.270 Loading mod base 2.0.60 (data.lua)
3.719 Loading mod Extended-Laser-Turrets 2.0.0 (data.lua)
3.754 Loading mod Flare_Stack_SA 2.3.2 (data.lua)
3.811 Loading mod fmsl 0.1.0 (data.lua)
3.854 Loading mod QueueToFrontLimited 2.0.3 (data.lua)
3.951 Loading mod Wind-Turbines-relaunched 2.1.2 (data.lua)
4.009 Loading mod advanced-electric-remade 0.0.2 (data.lua)
4.117 Loading mod artsCore 2.0.7 (data.lua)
4.197 Loading mod assembler-pipe-passthrough 2025.6.20 (data.lua)
4.371 Loading mod ATCTower 2.0.0 (data.lua)
4.501 Loading mod bobinserters 2.0.1 (data.lua)
4.584 Loading mod boblibrary 2.0.1 (data.lua)
4.658 Loading mod botReplacer 2.0.0 (data.lua)
4.741 Loading mod bullet-trails 0.7.1 (data.lua)
4.801 Loading mod car-finder 2.0.0 (data.lua)
4.839 Loading mod combat-mechanics-overhaul 0.7.2 (data.lua)
4.882 Loading mod concreep-redux 3.0.3 (data.lua)
4.905 Loading mod dbots-artillery-bombardment-remote 2.1.2 (data.lua)
4.936 Loading mod dedicated-bot-charger 1.0.3 (data.lua)
4.974 Loading mod Dirt_Path 2.0.1 (data.lua)
5.013 Loading mod DiscoScience 2.0.1 (data.lua)
5.082 Loading mod dysontorio_charging 1.1.2 (data.lua)
5.143 Loading mod ElectricFurnacesRevamp 1.1.1 (data.lua)
5.180 Loading mod ElectroTurret 2.0.2 (data.lua)
5.223 Loading mod elevated-rails 2.0.60 (data.lua)
5.317 Loading mod Enhanced_Roboports 1.2.2 (data.lua)
5.350 Loading mod Flare Stack 4.0.1 (data.lua)
5.382 Loading mod flib 0.16.3 (data.lua)
5.429 Loading mod Fluid-level-indicator 0.9.9 (data.lua)
5.455 Loading mod HandyCraft 1.0.0 (data.lua)
5.475 Loading mod HandyHandsRefactored 2.0.12 (data.lua)
5.500 Loading mod HelicopterRevival 0.3.1 (data.lua)
5.529 Loading mod HeroTurretRedux 1.0.30 (data.lua)
5.551 Loading mod informatron 0.4.0 (data.lua)
5.573 Loading mod Mammoth-MK3 1.1.2 (data.lua)
5.621 Loading mod Nearby-Ammo-Count-Fork 1.1.1 (data.lua)
5.633 Loading mod nixie-tubes 2.0.6 (data.lua)
5.671 Loading mod omnilib 4.2.5 (data.lua)
5.707 Loading mod Orphan Finder 1.2.2 (data.lua)
5.718 Loading mod power-armor-mk3 1.0.4 (data.lua)
5.739 Loading mod quality 2.0.60 (data.lua)
5.773 Loading mod RealisticDecorationCleanup 2.0.0 (data.lua)
5.785 Loading mod Repair_Turret 2.0.4 (data.lua)
5.812 Loading mod RoboportTweaks 1.3.2 (data.lua)
5.824 Loading mod robot-recall-space-age 0.3.2 (data.lua)
5.845 Loading mod RPGsystem 2.0.7 (data.lua)
5.870 Loading mod SchallPickupTower 2.0.1 (data.lua)
5.886 Loading mod SchallUncraft 2.0.3 (data.lua)
5.907 Loading mod shield-generators 0.6.0 (data.lua)
5.924 Loading mod ShockTurret3 0.1.94 (data.lua)
5.949 Loading mod solidwaste-pollution-filter 0.7.1 (data.lua)
5.969 Loading mod spidertron-extended 0.4.3 (data.lua)
6.015 Loading mod SpidertronEnhancements 1.10.8 (data.lua)
6.037 Loading mod Structure_Destroyed 1.2.2 (data.lua)
6.072 Loading mod TarawindBeacons2 1.2.1 (data.lua)
6.086 Loading mod tbx-equipment-grid-wagons 0.1.1 (data.lua)
6.107 Loading mod Todo-List 19.12.0 (data.lua)
6.119 Loading mod train-loader 0.9.1 (data.lua)
6.140 Loading mod UltimateBeltsSpaceAge 1.3.0 (data.lua)
6.156 Loading mod valves 2.1.0 (data.lua)
6.181 Loading mod visual-signals 1.1.2 (data.lua)
6.201 Loading mod Warehousing 1.0.3 (data.lua)
6.225 Loading mod WaterExtractor 1.0.2 (data.lua)
6.243 Loading mod ZCS-Trash-Landfill-Continued-Update 1.2.6 (data.lua)
6.256 Loading mod Atomic_Overhaul 1.3.36 (data.lua)
6.289 Loading mod bobassembly 2.0.2 (data.lua)
6.312 Loading mod boblogistics 2.0.3 (data.lua)
6.369 Loading mod bobmining 2.0.2 (data.lua)
6.406 Loading mod shield-projector 0.2.2 (data.lua)
6.426 Loading mod space-age 2.0.60 (data.lua)
6.826 Loading mod thermal-solar-power-lite 2.1.16 (data.lua)
6.855 Loading mod 5dim_core 2.0.39 (data.lua)
6.888 Loading mod Advanced-Electric-Revamped-v16 0.7.6 (data.lua)
6.922 Loading mod air-filtering 0.9.5 (data.lua)
6.950 Loading mod Aircraft-space-age 2.3.2 (data.lua)
6.983 Loading mod belt-casting 1.0.2 (data.lua)

it might be worse than that...ifI look at all the mod zip files I have (and I'm pretty sure all but one or two are enabled, I have):
5dim_core_2.0.39.zip
5dim_logistic_2.0.2.zip
ATCTower_2.0.0.zip
AdjustableModule_1.1.3.zip
Advanced-Electric-Revamped-v16_0.7.6.zip
Aircraft-space-age_2.3.2.zip
Atomic_Overhaul_1.3.36.zip
AutoDeconstruct_1.0.7.zip
Better-Power-Armor-Grid_7.3.2.zip
BuilderBotStart_0.4.3.zip
Cerys-Moon-of-Fulgora_4.3.2.zip
CleanedConcrete_2.0.0.zip
Concretexture_1.3.0.zip
DeterministicSeeds_1.0.1.zip
Dirt_Path_2.0.1.zip
DiscoScience_2.0.1.zip
ElectricFurnacesRevamp_1.1.1.zip
ElectricHeatingTowerFixed_0.3.1.zip
ElectroTurret_2.0.2.zip
Enhanced_Roboports_1.2.2.zip
'Evolution Reduction_2.0.0.zip'
Extended-Laser-Turrets_2.0.0.zip
FactorySearch_1.14.0.zip
'Flare Stack_4.0.1.zip'
Flare_Stack_SA_2.3.2.zip
Fluid-level-indicator_0.9.9.zip
HandyCraft_1.0.0.zip
HandyHandsRefactored_2.0.12.zip
HelicopterRevival_0.3.1.zip
HeroTurretRedux_1.0.30.zip
James-Train-Mod_2.0.19.zip
Kux-CoreLib_3.17.8.zip
Kux-CraftingTools_3.2.8.zip
Kux-GuiLib_3.0.10.zip
Kux-OrbitalIonCannon_3.8.14.zip
LSlib_James_Fork_2024.12.14.zip
Mammoth-MK3_1.1.2.zip
Nearby-Ammo-Count-Fork_1.1.1.zip
NoTimedSpoilage_1.0.0.zip
Noxys_StackSizeMultiplier_0.5.1.zip
OmegaDrill_0.3.8.zip
'Orphan Finder_1.2.2.zip'
PlanetsLib_1.11.0.zip
QueueToFrontLimited_2.0.3.zip
RPGsystem_2.0.7.zip
RealisticDecorationCleanup_2.0.0.zip
Repair_Turret_2.0.4.zip
RitnLib_0.9.5.zip
RoboportTweaks_1.3.2.zip
Robot256Lib_2.0.11.zip
SchallPickupTower_2.0.1.zip
SchallUncraft_2.0.3.zip
ShockTurret3_0.1.94.zip
SpidertronEnhancements_1.10.8.zip
StoneFromOxide_1.0.0.zip
Structure_Destroyed_1.2.2.zip
TarawindBeacons2_1.2.1.zip
Telogistics_1.0.30.zip
Todo-List_19.12.0.zip
UltimateBeltsSpaceAge_1.3.0.zip
Updated_Construction_Drones_2.0.4.zip
Warehousing_1.0.3.zip
WaterExtractor_1.0.2.zip
Waterfill_v17_2.0.5.zip
Wind-Turbines-relaunched_2.1.2.zip
ZCS-Trash-Landfill-Continued-Update_1.2.6.zip
advanced-electric-remade_0.0.2.zip
air-filtering_0.9.5.zip
artsCore_2.0.7.zip
assembler-pipe-passthrough_2025.06.20.zip
belt-casting_1.0.2.zip
bobassembly_2.0.2.zip
bobinserters_2.0.1.zip
boblibrary_2.0.1.zip
boblogistics_2.0.3.zip
bobmining_2.0.2.zip
botReplacer_2.0.0.zip
bullet-trails_0.7.1.zip
car-finder_2.0.0.zip
combat-mechanics-overhaul_0.7.2.zip
concreep-redux_3.0.3.zip
crafting-efficiency-2_0.2.20.zip
dbots-artillery-bombardment-remote_2.1.2.zip
dedicated-bot-charger_1.0.3.zip
dysontorio_charging_1.1.2.zip
easy-wind-turbine_2.0.12.zip
electric-tiles_1.2.10.zip
electric-trains_0.4.1.zip
enemies-drops-items_2.2.0.zip
ev-assets_2.4.3.zip
ev-mining-drills_3.1.4.zip
factorissimo-2-notnotmelon_3.9.6.zip
flib_0.16.3.zip
fmsl_0.1.0.zip
furnace-recipe-selection_1.2.6.zip
heat-processing_0.3.7.zip
heat_glow_2.0.3.zip
informatron_0.4.0.zip
inventory-repair_20.0.3.zip
invincible-worker-bots_1.0.0.zip
ixuClock_0.3.0.zip
kry-vehicle-grids_2.1.23.zip
kry_stdlib_2.0.6.zip
lane-balancers_1.2.1.zip
longer-belts-redux_2.0.0.zip
migratus-orchestrus_1.0.3.zip
mod-list.json
mod-settings.dat
modular-beacon-power_1.1.0.zip
nixie-tubes_2.0.6.zip
offshore-dump_0.1.3.zip
omnilib_4.2.5.zip
pickitup_2.0.3.zip
power-armor-mk3_1.0.4.zip
pure-modules_0.6.0.zip
quality-heat-pipes_1.0.5.zip
reusable-rocket-simple-fixed_1.4.0.zip
reverse-factory_9.0.36.zip
robot-recall-space-age_0.3.2.zip
rz-quality-labs_0.1.0.zip
science-pack-glow-reborn_1.0.4.zip
shield-generator_1.0.3.zip
shield-generators_0.6.0.zip
shield-projector_0.2.2.zip
solidwaste-pollution-filter_0.7.1.zip
some-squeak-through_2.0.0.zip
spider-launcher_2.8.0.zip
spidertron-extended_0.4.3.zip
spoilage-solution_1.0.0.zip
squeak-through-2_0.1.2.zip
sulfur-from-acid-neutralisation_0.0.1.zip
supply-labs-with-construction-robots_2.0.1.zip
tbx-equipment-grid-wagons_0.1.1.zip
thermal-solar-power-lite_2.1.16.zip
toolbars-mod_2.38.2.zip
train-loader_0.9.1.zip
transport-ring-teleporter_0.3.2.zip
underground-heat-pipe_2.2.2.zip
upgradeable-quality_0.1.2.zip
valves_2.1.0.zip
vanilla-loaders-hd_2.2.1.zip
visible-planets_1.5.3.zip
visual-signals_1.1.2.zip
vtk-deep-core-mining_3.2.6.zip
water-poles_0.0.6.zip

...I might have an addiction :)

I do wonder if it might be upgradeable-quality_0.1.2.zip since that upgrades quality of things 'in the field' as they're used...

And this crashes on start up, yes?

yes

I have the exactly same issue but with a different (and also ridiculous) mod list:
Base mod 2.0.60
Elevated Rails 2.0.60
Quality 2.0.60
Space Age 2.0.60
Corrundum 1.0.43
AAI Signal Transmission 0.5.1
Abandoned Ruins - Base 0.1.2
Abandoned Ruins - Updated 1.3.18
Advanced Furnaces 2 SpaceAgeFix 0.2.13
Alien Biomes 0.7.4
Alien Biomes Graphics 0.7.1
Alien Loot Economy 2.1.0
All Quality From The Start 0.0.2
Ammo Loader+ 2.0.5
Armoured Biters 1.2.1
Asteroids Stack to Four 1.0.0
Auto Deconstruct 1.0.7
Automated Fuel & Ammo 0.3.3
Automatic Train Painter 2.0.1
Bob's Adjustable Inserters Mod 2.0.1
Bottleneck 0.12.1
Chests... IN SPACE! 0.1.0
Chicken 1.0.6
Clean Floor 2.0.0
Cold Chain Logistics 0.2.1
Combinator Toggle 1.0.0
Compakt Circuits 2.0.23
Delete Chunks 2.0.0
Electric Tiles 1.2.10
Entities Drop Content 1.1.0
Explosive Biters 2.3.1
Factorio Library 0.16.3
Factorissimo 3 3.9.6
Flare Stack for 2.0 2.3.2
Flow Configuration 2.1.4
Fluid Must Flow 1.4.3
Frost Biters 2.1.0
Fulgoran enemies 0.1.9
heat-engine 0.1.4
Infinity Chest Start 1.0.1
Informatron 0.4.0
Inlaid Lamps Extended 2.0.0
Inventory Repair 20.0.3
Kryzeth Standard Library 2.0.6
Large Storage Tank 1.2.1
Laser Rifle 2.0.4
Let me laser down asteroids! 1.0.4
Linked Belts 0.1.5
Linked Chest and Linked Pipe 1.2.76
Loot Chest+ 2.0.1
Manual Inventory Sorting 2.3.0
Memory Storage 1.6.8
MFerrari graphics pack 1 0.0.1
Mferrari lib 0.5.4
Miniloader (Redux) 0.9.1
Navigation Beacon 1.0.1
Nixie Tubes 2.0.6
Nukes Destroy Cliffs 20.0.1
Omega Drill 0.3.8
Packing Tape 20.0.7
Peppermint Mining 2.3.2
Planet Picker 0.4.3
Quality Assurance 1.4.0
Quality Heat Pipes 1.1.1
Quasar Chests 0.2.0
Realistic Ruins - Updated to 2.0 0.0.8
Reverse Factory 9.0.36
RPG System 2.0.7
Ruin Maker - Updated 0.1.6
Schall Remains & Pickup 2.0.2
Sorted Chests 2.0.0
Speed Control 2.0.1
Spidertron Enhancements 1.10.8
Spoilage Scanner 0.3.4
Spoiling Plant 1.0.2
Spotlight 1.0.2
Squeak Through 2 0.1.2
Switch Button updated for 2.0 0.2.3
Teleportation_Redux 2.0.2
Teleporters 2.0.0
Teleporters Space Age 1.2.0
Telogistics 1.0.30
The Ruins Mod - Fortress Ruins 1.1.0
The Ruins Mod - OldAbandonedSettlements 1.0.4
The Ruins Mod - Planet settings 0.1.3
The Ruins Mod 2.0 - Silly extension 0.3.0
Total Productivity 2.0.5
Tree Collision 2.0.0
Underground heat pipe 2.2.2
Vehicle Corpses 0.1.3
VehicleSnap 2.0.2
Warehousing Mod 1.0.3
Water Poles 0.0.6
Water Pumpjack 2.4.2
Waterfill 2.0.5

This is strange lol, I don't have the issue on my end running vanilla settings. With the way the mod works, this crash implies that the heat-pipe prototype does NOT have their max health defined. Which is an odd thing, especially because the vanilla heat-pipes do infact have their max health defined. I can add something in that would work around that, but I would definitely prefer to figure out what is causing the issue

Edit: Actually you both have underground heat pipes enabled. It appears that mod creates extra heat pipe prototypes, without the health defined, which leads to the error you are getting

Let me know if this fixes your issues. It works on my end now

the game loads, and so does my save file, so it looks like that was it. Thanks for tracking this down so quickly!

No problem, thanks for the help finding the issue