Describe the bug

Do you have an error log of what happened?

To Reproduce

1. Create a Dynamic Group
2. Create any Aura inside that Dynamic Group
3. Try to use this CustomGrow function
   function(newPositions, activeRegions) local mid = #activeRegions / 2 for i = 1, 4 do newPositions[i] = { 40 * (i - mid), 0.5 * (i - mid)^2 } end end
4. Can't close the Lua editor by saving the code. You have to use the "Cancel" button. You can save your code by using Ctrl+S but that also won't close the Lua editor.
5. The "/wa" in the EditBox doesn't disappear and somtimes you have to press enter several times until the WA Options Frame shows up.

Screenshots

Did you try having WeakAuras as the only enabled addon and everything else (especially something like ElvUI) disabled?

Yes

Which version of WeakAuras are you using?

2.14.1

Was it working in a previous version? If yes, which was the last good one?

Yes in 2.13.4

Additional context
I know that you can avoid this error by nil checking activeRegions[i] and at first i wasn't sure if i should report this as a bug but i thought that it can cause some errors when people don't update their auras that are not "well written". I also apologize for my very bad english :( .

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Yeah of course. Oops^^.
20x WeakAuras\RegionTypes\DynamicGroup.lua:1052: table index is nil
WeakAuras\RegionTypes\DynamicGroup.lua:1052: in function DoPositionChildren' WeakAuras\RegionTypes\DynamicGroup.lua:935: in function PositionChildren'
WeakAuras\RegionTypes\DynamicGroup.lua:917: in function SortUpdatedChildren' WeakAuras\RegionTypes\DynamicGroup.lua:736: in function Resume'
WeakAuras\WeakAuras-2.14.1.lua:5569: in function <WeakAuras\WeakAuras.lua:5528>
WeakAuras\WeakAuras-2.14.1.lua:5645: in function `UpdatedTriggerState'
WeakAuras\BuffTrigger2.lua:1254: in function <WeakAuras\BuffTrigger2.lua:1246>
WeakAuras\BuffTrigger2.lua:1537: in function <WeakAuras\BuffTrigger2.lua:1530>

Locals:
self = {
0 =
controlledChildren =

Please provide the error message you receive.

Great, thanks. @mrbuds you touched this last, so you get to fix this.

When you open WA this error also shows up.

1x WeakAuras\RegionTypes\DynamicGroup.lua:1052: table index is nil
WeakAuras\RegionTypes\DynamicGroup.lua:1052: in function DoPositionChildren' WeakAuras\RegionTypes\DynamicGroup.lua:935: in function PositionChildren'
WeakAuras\RegionTypes\DynamicGroup.lua:917: in function SortUpdatedChildren' WeakAuras\RegionTypes\DynamicGroup.lua:736: in function Resume'
WeakAuras\WeakAuras-2.14.1.lua:1739: in function `ResumeAllDynamicGroups'
WeakAurasOptions\WeakAurasOptions-2.14.1.lua:1623: in function <WeakAurasOptions\WeakAurasOptions.lua:1580>

Its at the exact same line but maybe its helpful.

Your function is returning wrong data and it's fine that it make errors to let you know about it, i'll see if error handler can be improved.

fix for your function

function(newPositions, activeRegions)
    local mid = #activeRegions / 2
    local max = math.min(#activeRegions, 4)
    for i = 1, max do
        newPositions[i] = { 40 * (i - mid), 0.5 * (i - mid)^2 }
    end
end

I know its wrong. I copied and changed the example on purpose.

I know that you can avoid this error by nil checking activeRegions[i] and at first i wasn't sure if i should report this as a bug but i thought that it can cause some errors when people don't update their auras that are not "well written".

The real problem is that you can't close any lua editor if one aura is causing that error. Thought that might be enough for a bug report 😢 .

You were right to make a bug report, next update will improve this