No theories on this one.

6x C stack overflow
[C]: ?
[C]: in function SetText' Neuron\Neuron-Buttons.lua:2518: in function MACRO_SetTooltip'
Neuron\Neuron-Buttons.lua:2543: in function `MACRO_OnEnter'
Neuron\Neuron-Buttons.lua:3401: in function <Neuron\Neuron-Buttons.lua:3401>
[C]: ?
[C]: ?
[C]: ?
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...
[C]: ?
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Locals:
(*temporary) = GameTooltip {
0 =
SetExistingSocketGem = defined =[C]:-1
SetCurrencyToken = defined @Altoholic\Tooltip.lua:700
SetGuildBankItem = defined =[C]:-1
SetVoidItem = defined =[C]:-1
SetVoidDepositItem = defined =[C]:-1
SetVoidWithdrawalItem = defined =[C]:-1
hasMoney = 1
TopOverlay = {
}
Hide = defined =[C]:-1
comparing = false
SetSocketGem = defined =[C]:-1
SetHyperlink = defined =[C]:-1
Show = defined =[C]:-1
SetUnitDebuff = defined =[C]:-1
TMW_SetEquiv = defined @TellMEwhen\Options\TellMeWhen_Options.lua:165
SetLootItem = defined =[C]:-1
SetQuestItem = defined =[C]:-1
SetItemByID = defined =[C]:-1
ttGradient = {
}
numMoneyFrames = 2
SetHeirloomByItemID = defined =[C]:-1
SetTrainerService = defined =[C]:-1
SetInboxItem = defined =[C]:-1
SetBuybackItem = defined =[C]:-1
shoppingTooltips =

{
}
FadeOut = defined @tiptac\ttCore.lua:856
SetMerchantItem = defined =[C]:-1
SetQuestLogItem = defined =[C]:-1
SetRecipeReagentItem = defined @Altoholic\Tooltip.lua:700
SetUnitBuff = defined =[C]:-1
TMW_SetSpellByIDWithClassIcon = defined @TellMEwhen\Components\Core\Spells\ClassSpellCache.lua:214
SetTradePlayerItem = defined =[C]:-1
SetIconTextureAndText = defined @TipTacItemRef\ttItemRef.lua:62
ttIcon = {
}
TMW_SetDogTag = defined @TellMEwhen\Components\Core\Common\DogTags\config.lua:398
updateTooltip = 0.13699999712408
SetInventoryItem = defined =[C]:-1
SetTradeTargetItem = defined =[C]:-1
ttCount = {
}
SetLootRollItem = defined =[C]:-1
SetUnitAura = defined =[C]:-1
SetSendMailItem = defined =[C]:-1
SetAuctionSellItem = defined =[C]:-1
SetBagItem = defined =[C]:-1
needsReset = true
BottomOverlay = {
}
SetRecipeResultItem = defined =[C]:-1
TMW_SetFrameHighlight = defined @TellMEwhen\Components\GroupModules\GroupModule_GroupPosition\Config.lua:193
SetAuctionItem = defined =[C]:-1
}
(*temporary) = defined =[C]:-1
(*temporary) = GameTooltip {
0 =
SetExistingSocketGem = defined =[C]:-1
SetCurrencyToken = defined @Altoholic\Tooltip.lua:700
SetGuildBankItem = defined =[C]:-1
SetVoidItem = defined =[C]:-1
SetVoidDepositItem = defined =[C]:-1
SetVoidWithdrawalItem = defined =[C]:-1
hasMoney = 1
TopOverlay = {
}
Hide = defined =[C]:-1
comparing = false
SetSocketGem = defined =[C]:-1
SetHyperlink = defined =[C]:-1
Show = defined =[C]:-1
SetUnitDebuff = defined =[C]:-1
TMW_SetEquiv = defined @TellMEwhen\Options\TellMeWhen_Options.lua:165
SetLootItem = defined =[C]:-1
SetQuestItem = defined =[C]:-1
SetItemByID = defined =[C]:-1
ttGradient = {
}
numMoneyFrames = 2
SetHeirloomByItemID = defined =[C]:-1
SetTrainerService = defined =[C]:-1
SetInboxItem = defined =[C]:-1
SetBuybackItem = defined =[C]:-1
shoppingTooltips = {
}
FadeOut = defined @tiptac\ttCore.lua:856
SetMerchantItem = defined =[C]:-1
SetQuestLogItem = defined =[C]:-1
SetRecipeReagentItem = defined @Altoholic\Tooltip.lua:700
SetUnitBuff = defined =[C]:-1
TMW_SetSpellByIDWithClassIcon = defined @TellMEwhen\Components\Core\Spells\ClassSpellCache.lua:214
SetTradePlayerItem =

Neuron\Neuron-Buttons.lua:3401

This line of code doesn't exist anymore, is this with an old version?