im playing a rather heavely modded space exploration run, but when i "Shift + F" on an express belt to set up the pickup position, i get this crash message:
game version (1.1.94 stable)

The mod Quick Adjustable Inserters (1.1.1) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event quick-adjustable-inserters::on_selected_entity_changed (ID 54)
LuaEntity doesn't contain key belt_shape.
stack traceback:
[C]: in function 'index'
__inserter-throughput-lib/inserter_throughput.lua:641: in function 'pickup_from_entity'
inserter-throughput-lib/inserter_throughput.lua:658: in function 'pickup_from_position'
inserter-throughput-lib/inserter_throughput.lua:684: in function 'pickup_from_pickup_target_of_inserter'
inserter-throughput-lib/inserter_throughput.lua:693: in function 'pickup_from_pickup_target_of_inserter_and_set_pickup_vector'
quick-adjustable-inserters/control.lua:2283: in function 'estimate_inserter_speed'
quick-adjustable-inserters/control.lua:2415: in function 'update_inserter_speed_text'
quick-adjustable-inserters/control.lua:3882: in function <quick-adjustable-inserters/control.lua:3877>

this is the mod list:

aai-containers
aai-industry
aai-signal-transmission
aai-containers
Air-Filtering_Fix
alien-biomes
alien-biomes-hr-terrain
artillery-bombardment-remote
BeltRouter
quick-adjustable-inserters -----
bobinserters -----
boblibrary -----
BottleneckLite
bullet-trails
calculator-ui
CleanFloor
combat-mechanics-overhaul
Crafting_Speed_Increase
deadlock-beltboxes-loaders-ost
Deadlock-SE-bridge-ost
equipment-gantry
even-distribution
factorio-reach
fireproof-bots
Flare Stack
flib
FluidMustFlow
FluidMustFlowSE
FluidWagonColorMask
Full_Power_Coverage_017
glutenfree-se-rocket-launch-pad-label
helmod
ImprovedCombinatorSE
informatron
InlaidLampsExtended
inserter-throughput-lib
jetpack
k2-fluid-storage
Kux-CoreLib
Kux-OrbitalIonCannon
LandfillEverything
lightArtillery
LightedPolesPlus
LoaderRedux
LogisticTrainNetwork
LtnManager
LTN_Combinator_Modernized
Lubricant_Easy
Milestones
miniloader
mining-patch-planner
MiscLib
More_Ammo
MushroomCloud
pickitup --------
playtime
Power Armor MK3
pump
qol_research
RealisticReactorGlow
Realistic_Heat_Glow
RitnLib
Robocharger
Roboport Recharge Upgrade
RoboportBigPole
robotworld-continued
robot_attrition
Robot_Battery_Research
rockets-more-range
scattergun_turret
se-bot-start
SE_smooth_ship_walls
shield-projector
simhelper
space-exp-early-logistics
space-exploration
space-exploration-graphics
space-exploration-graphics-2
space-exploration-graphics-3
space-exploration-graphics-4
space-exploration-graphics-5
space-exploration-hr-graphics
space-exploration-menu-simulations
space-exploration-postprocess
space-exploration-scripts
SpaceLoaderRedux
Speedy-Trains
Squeak Through
StatsGui
stdlib
TrainSkipFulfilledStation
u-235
ups-fps
UraniumArtilleryShells
VehicleSnap
Warehousing
WideChests
WideChests-aai-reskin
WideChests_AAI_Containers_Fix

Oooh, right, I forgot that belt_shape is actually a very recent addition to the api. It got added in Factorio 1.1.100 specifically. 1.1.101 is stable now so I feel like it's fine that the mod is dependent on it, I'll just need to add that version check as a dependency to the inserter throughput library mod.

Is it alright with you if you have to update the game to 1.1.100 or higher? Theoretically I could add logic that works without belt_shape for support for older versions, I'm just not sure how common it would be for people to run older versions

Alright I've decided to add support for Factorio versions 1.1.99 and lower, but I won't be releasing that update instantly since this isn't like a super hot fix. It'll come with Inserter Throughput Lib 1.1.3, whenever that comes out. If no other issues get reported for that mod I'll just release this one change in the comming days.

Thank you for the report!

amazing!

killer mod btw, love it!

The update to Inserter Throughput Lib has been released if you haven'd updated the game instead already ;)