I believe this is the same or very similar error while just opening mail after login:

26x TokenPrice\core.lua:453: attempt to index local 'lastPrice' (a nil value)
[string "@TokenPrice\core.lua"]:453: in function UpdateBrokerText' [string "@TokenPrice\core.lua"]:526: in function ?'
[string "@PetTracker\libs\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:119: in function <...ker\libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:119>
[string "=[C]"]: ?
[string "@PetTracker\libs\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:29: in function <...ker\libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:25>
[string "@PetTracker\libs\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:64: in function `Fire'
[string "@PetTracker\libs\AceEvent-3.0\AceEvent-3.0-4.lua"]:120: in function <PetTracker\libs\AceEvent-3.0\AceEvent-3.0.lua:119>

While out @ my Tiller's farm today:

29x TokenPrice\core.lua:453: attempt to index local 'lastPrice' (a nil value)
[string "@TokenPrice\core.lua"]:453: in function UpdateBrokerText' [string "@TokenPrice\core.lua"]:526: in function ?'
[string "@PetTracker\libs\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:119: in function <...ker\libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:119>
[string "=[C]"]: ?
[string "@PetTracker\libs\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:29: in function <...ker\libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:25>
[string "@PetTracker\libs\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:64: in function `Fire'
[string "@PetTracker\libs\AceEvent-3.0\AceEvent-3.0-4.lua"]:120: in function <PetTracker\libs\AceEvent-3.0\AceEvent-3.0.lua:119>

5x TokenPrice\core.lua:539: attempt to index local 'data' (a nil value)
[string "@TokenPrice\core.lua"]:539: in function GetPeaks' [string "@TokenPrice\core.lua"]:380: in function SetTooltipText'
[string "@TokenPrice\core.lua"]:435: in function <TokenPrice\core.lua:426>
[string "@titan\LDBToTitan.lua"]:327: in function <Titan\LDBToTitan.lua:286>

Locals:
self =

{
SetDefaultModuleLibraries = defined @!KalielsTracker\Libs\AceAddon-3.0\AceAddon-3.0.lua:367
elapsed = 222.259004
GetAnchors = defined @TokenPrice\core.lua:403
modules = {
}
baseName = "TokenPrice"
IterateEmbeds = defined @!KalielsTracker\Libs\AceAddon-3.0\AceAddon-3.0.lua:442
SecureHookScript = defined @AdiBags\libs\AceHook-3.0\AceHook-3.0.lua:410
enabled = true
RawHookScript = defined @AdiBags\libs\AceHook-3.0\AceHook-3.0.lua:395
SetDefaultModulePrototype = defined @!KalielsTracker\Libs\AceAddon-3.0\AceAddon-3.0.lua:409
GetPercentDifference = defined @TokenPrice\core.lua:269
nextUpdate = 1612314044
defaultModuleState = true
OpenContextMenu = defined @TokenPrice\core.lua:157
IsEnabled = defined @!KalielsTracker\Libs\AceAddon-3.0\AceAddon-3.0.lua:451
DisableModule = defined @!KalielsTracker\Libs\AceAddon-3.0\AceAddon-3.0.lua:350
module = {
}
RegisterMessage = defined @PetTracker\libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:90
UnregisterMessage = defined @PetTracker\libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:153
hooks = {
}
db = {
}
GetRealMoneyPrice = defined @TokenPrice\core.lua:225
SetEnabledState = defined @!KalielsTracker\Libs\AceAddon-3.0\AceAddon-3.0.lua:424
Hook = defined @AdiBags\libs\AceHook-3.0\AceHook-3.0.lua:274
enabledState = true
RegisterEvent = defined @PetTracker\libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:90
IterateModules = defined @!KalielsTracker\Libs\AceAddon-3.0\AceAddon-3.0.lua:437
RawHook = defined @AdiBags\libs\AceHook-3.0\AceHook-3.0.lua:313
GetPriceChange = defined @TokenPrice\core.lua:553
CancelTicker = defined @TokenPrice\core.lua:578
SetTooltipText = defined @TokenPrice\core.lua:307
pollTime = 300
Enable = defined @!KalielsTracker\Libs\AceAddon-3.0\AceAddon-3.0.lua:294
NewModule = defined @!KalielsTracker\Libs\AceAddon-3.0\AceAddon-3.0.lua:235
GetModule = defined @!KalielsTracker\Libs\AceAddon-3.0\AceAddon-3.0.lua:210
CreateBroker = defined @TokenPrice\core.lua:414
defaultModuleLibraries = {
}
OnUpdate = defined @TokenPrice\core.lua:141
GetPeaks = defined @TokenPrice\core.lua:531
GetName = defined @!KalielsTracker\Libs\AceAddon-3.0\AceAddon-3.0.lua:279
GetBattleNetRedeemPrice = defined @TokenPrice\core.lua:234
orderedModules = {
}
Disable = defined @!KalielsTracker\Libs\AceAddon-3.0\AceAddon-3.0.lua:314
InitializeUpdater = defined @TokenPrice\core.lua:472
GetTimeLeftString = defined @TokenPrice\core.lua:488
HookScript = defined @AdiBags\libs\AceHook-3.0\AceHook-3.0.lua:366
ticker = {
}
name = "TokenPrice"
PerformDatabaseMaintenance = defined @TokenPrice\core.lua:126
UnregisterAllEvents = defined @PetTracker\libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:174
IsModule = defined @!KalielsTracker\Libs\AceAddon-3.0\AceAddon-3.0.lua:468
NewTicker = defined @TokenPrice\core.lua:582
SetDefaultModuleState = defined @!KalielsTracker\Libs\AceAddon-3.0\AceAddon-3.0.lua:387
EnableModule = defined @Inte