i had the following issue that came out of nowhere, i was running arround controlling a squad of 7 spidertrons and the modded one from the Broodmother mod, no UPS slowdown or anything before
i also had btop running on another monitor and no cpu or gpu spike happened either

```The mod Spidertron squad control [BETA RELEASE] (0.5.1) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event Spider_Control::on_nth_tick(20)
LuaEntity API call when LuaEntity was invalid.
stack traceback:
[C]: in function 'index'
__Spider_Control/control/player_follow.lua:56: in function 'UpdateFollow'
Spider_Control/control.lua:73: in function <Spider_Control/control.lua:72>```

bigger log

20668.436 Uploaded files to cloud
20668.436 Info AppManager.cpp:308: Saving finished
20998.897 Info AppManager.cpp:307: Saving to _autosave5 (non-blocking).
20999.022 Info AsyncScenarioSaver.cpp:165: Saving process PID: 180345
21001.135 Info ChildProcessAgent.cpp:61: Child 180345 exited with return value 0
21001.135 Uploaded files to cloud
21001.135 Info AppManager.cpp:308: Saving finished
21279.298 Error MainLoop.cpp:1404: Exception at tick 36555440: The mod Spidertron squad control [BETA RELEASE] (0.5.1) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event Spider_Control::on_nth_tick(20)
LuaEntity API call when LuaEntity was invalid.
stack traceback:
[C]: in function 'index'
__Spider_Control/control/player_follow.lua:56: in function 'UpdateFollow'
Spider_Control/control.lua:73: in function <Spider_Control/control.lua:72>

and the list of mods i run

{
AdvancedBelts = "2.0.7",
ArtilleryShellResearch = "0.1.0",
AutoDeconstruct = "0.4.4",
Automatic_Train_Painter = "1.2.0",
BeltRouter = "1.5.2",
BetterRoboport = "1.1.0",
Big_Brother = "0.5.4",
Bottleneck = "0.11.7",
Broodmother = "1.1.1",
ChokePoint = "1.152.1",
ClosestFirstOneDotOne = "1.1.0",
["Constructron-Continued"] = "1.1.23",
DeadlockBlackRubberBelts = "1.0.5",
DiscoScience = "1.1.4",
DoingThingsByHand = "1.2.2",
DragonIndustries = "1.152.1",
Enhanced_Map_Colors = "1.5.5",
FNEI = "0.4.2",
["Fluid-level-indicator"] = "0.8.6",
GDIW = "1.1.0",
GUI_Unifyer_forked = "1.12.1",
IntelligentSpidertrons = "1.0.1",
["Invulnerable-Belts"] = "1.0.0",
JESUS_CHRIST_ITS_A_TRAIN_GET_OFF_THE_TRACKS = "1.0.5",
["Kux-CoreLib"] = "2.11.0",
["Kux-OrbitalIonCannon"] = "2.4.1",
Milestones = "1.3.25",
MiscLib = "0.9.2",
ModuleInserterSimplified = "2.0.2",
MoreCraftingGroups = "1.2.4",
PipeVisualizer = "2.2.1",
["Power Armor MK3"] = "0.4.7",
Processing_Unit_Stack_to_200 = "0.9.9",
RampantArsenal = "1.1.6",
RateCalculator = "3.2.7",
RecipeBook = "3.5.10",
Repair_Turret = "1.0.3",
SearchlightAssault = "2.2.19",
SolarRatio = "0.0.4",
Spider_Control = "0.5.1",
UMModulesRework = "1.1.0",
UltimateResearchQueue = "1.1.0",
["Unlimited-Resources-Oil-Refresh"] = "0.2.0",
VehicleSnap = "1.18.5",
YARM = "0.10.14",
["actual-craft-times-remade"] = "1.0.6",
["alien-biomes"] = "0.6.8",
["alien-biomes-hr-terrain"] = "0.6.1",
arrowlib = "0.1.3",
base = "1.1.110",
beautiful_bridge_railway = "1.1.1",
["blueprint-sandboxes"] = "1.19.1",
["bullet-trails"] = "0.6.2",
["car-finder"] = "1.5.2",
["ch-concentrated-solar"] = "0.3.3",
["color-coded-pipe-planner"] = "0.0.3",
["color-coded-pipes"] = "0.0.8",
["days-without-incident"] = "0.1.2",
["dqol-resource-monitor"] = "1.1.2",
["equipment-gantry"] = "0.1.5",
["even-distribution"] = "1.0.10",
["factorissimo-2-notnotmelon"] = "1.4.3",
factory_graph = "1.0.9",
far_reach = "1.0.1",
flib = "0.14.2",
["game-speed-button"] = "0.0.5",
informatron = "0.3.4",
instant_research = "1.0.0",
["map-tag-core"] = "0.1.2",
["map-tag-generator"] = "1.2.9",
["map-tag-gps"] = "0.4.0",
["miniloader-forked"] = "0.0.1",
["mining-patch-planner"] = "1.6.11",
["more-resources-from-oil-processing"] = "0.1.3",
petcat = "0.1.7",
["production-potential"] = "1.4.0",
railway_signalling_overseer = "1.1.27",
["regenerate-terrain"] = "0.3.1",
["remote-monitor"] = "0.0.4",
["shield-projector"] = "0.1.6",
["show-max-underground-distance"] = "0.0.9",
["solar-productivity"] = "0.5.1",
["some-spidertron"] = "1.1.3",
["squeak-through-2"] = "0.0.4",
stdlib = "1.4.8",
tarantulator = "1.4.0",
trainsaver = "0.0.28"
}

feel free to ask for anything else, i have the latest autosave and log if needed, it's just really heavy for my internet