This error happens after removing Landfill Plus landfill tiles near to a helicopter.

Error MainLoop.cpp:1284: Exception at tick 2593: The mod HelicopterRevival (0.2.1) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event HelicopterRevival::on_tick (ID 0)
LuaEntity API call when LuaEntity was invalid.
stack traceback:
        [C]: in function '__index'
        __HelicopterRevival__/logic/emptyBoxCollider.lua:80: in function <__HelicopterRevival__/logic/emptyBoxCollider.lua:79>
        (...tail calls...)
        __HelicopterRevival__/logic/emptyBoxCollider.lua:103: in function <__HelicopterRevival__/logic/emptyBoxCollider.lua:100>
        (...tail calls...)
        __HelicopterRevival__/logic/heliBase.lua:1034: in function 'updateEntityPositions'
        __HelicopterRevival__/logic/heliBase.lua:464: in function 'OnTick'
        __HelicopterRevival__/logic/util.lua:99: in function 'checkAndTickInGlobal'
        __HelicopterRevival__/control.lua:126: in function <__HelicopterRevival__/control.lua:125>

I know this...
This was reported before, but I set it up as a super low priority cause, well... Most people don't dig ground under items c:

This may be patched in the next version, but unsure of that...

A good practice —and recommended in the documentation— is checking the validity of each entity you hold a reference to, since it's always possible that any mod or the vanilla game itself invalidate any entity before you use it again.

A good practice —and recommended in the documentation— is checking the validity of each entity you hold a reference to, since it's always possible that any mod or the vanilla game itself invalidate any entity before you use it again.

Eh... If it was that simple that would be fixed eons ago c:

Edit: Also, fixed.

Eh... If it was that simple that would be fixed eons ago c:

It's literally pretty much like:

if entity.valid() then
    --[[ actions ]]
end

Eh... If it was that simple that would be fixed eons ago c:

It's literally pretty much like:

if entity.valid() then
    --[[ actions ]]
end

Yes. Programming is super easy, look!

if not false then true

See? Everyone can do it! What? I'm not going to tell you what and where to look for this condition, especially if there's a million of interconnected entities. I'm just going to tell you the solution is super mega simple.

Please.

If' you're interested in solution, here. If not, eh.

In either case, closing this thread because, a: Bug had been fixed, and b: this conversation is getting non-sensical.