Thanks for the update! :D

Oh, nope. Still not working for me. The error message says:
Failed to load mod "walls-block-spitters0.1.4"
walls-block-spitters/data.lua:103:attempt to index field 'damage' (a nil value)

Thanks for reporting this. I'm pretty sure that vanilla does not have that problem so I think a mod is adding a biter with a different attack format. I'm putting in extra checks to make sure the format is compatible which should fix the problem, but could you also list the mods you are using (mod-list.json) so I can find which one is causing the problem?

Quite a few. Notably relating to biters, Natural Evolution and Rampant AI.

Mods:
base
color-picker
Additional-Turret
AdvancedRadar
air-filtering
AlienWall
AmmoBox
AsphaltRoads
autofill
Barbed-Wire
BetterFluidColors
bobinserters
boblibrary
Bottleneck
brighter-wagon-color-mask
bullet-trails
Chainsaw
clock
cncs_Plasma_shotgun_shells
concrete-and-stone
CpeBusyBots
data-raw-prototypes
detached-gun-sounds
electric-vehicles-lib
ExplosiveExcavation
Extra_Large_Storage_Tanks
filtered-deconstruction-planner
Flare
ForceFields
GDIW
HandyHands
Honk
ItemCount
KBlueprints
LightedElectricPoles
long-reach-research
LR_Turret
minimap-autohide
Natural_Evolution_Enemies
off-grid-effects
PavementDriveAssist
Personal_Spawns
RailPowerSystem
Reactors
Reinforced-Walls
ReverseRotate
Single-Splitter
slowkey
SqueakThrough
Teleportation
textplates
TombStones
TrainSpeedLimit
TreeSaplings
upgrade-planner
UsefulMapColors
VersepellesChunkMarkers
WagonCapacityColor
Warehousing
water-fix
wireless-charging-lib
Aircraft
alien-biomes
AtomicLocomotives
bobwarfare
BottleneckLogistics
CpeConcreteer
CpeTreeCutter
electric-vehicles
long-mine-research
long-pickup-research
NuclearRobots
Rampant
wireless-charging
LateUpgrades
long-loot-research
OrbitalIonCannon
SatelliteUplinkStation

Bob's Enemies is also changing too much to let this work