Easy to replicate on lvl 1; use a hearthstone

3x ArcHUD3\Rings\Casting.lua:142: attempt to perform arithmetic on local 'endTime' (a boolean value)
ArcHUD3\Rings\Casting.lua:142: in function `?'
ArcHUD3\RingTemplate.lua:1186: in function <ArcHUD3\RingTemplate.lua:1182>

Locals:
self =

{
SetDefaultModuleLibraries = defined @ArcHUD3\Libs\AceAddon-3.0\AceAddon-3.0.lua:398
Enable = defined @ArcHUD3\Libs\AceAddon-3.0\AceAddon-3.0.lua:325
UnregisterAllEvents = defined @ArcHUD3\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:200
SpellcastFailed = defined @ArcHUD3\Rings\Casting.lua:264
EnableModule = defined @ArcHUD3\Libs\AceAddon-3.0\AceAddon-3.0.lua:363
modules = {
}
GetModule = defined @ArcHUD3\Libs\AceAddon-3.0\AceAddon-3.0.lua:241
IterateEmbeds = defined @ArcHUD3\Libs\AceAddon-3.0\AceAddon-3.0.lua:473
defaultModuleState = true
defaultModuleLibraries = {
}
UNIT_SPELLCAST_CHANNEL_START = defined @ArcHUD3\Rings\Casting.lua:168
baseName = "ArcHUD3"
channeling = 0
options = {
}
optionsTable = {
}
Time = {
}
Text = {
}
SetDefaultModulePrototype = defined @ArcHUD3\Libs\AceAddon-3.0\AceAddon-3.0.lua:440
f = ArcHUD_Casting_Ring {
}
isInitialized = true
spellstart = 24793603
name = "ArcHUD_Casting"
Initialize = defined @ArcHUD3\Rings\Casting.lua:36
IsEnabled = defined @ArcHUD3\Libs\AceAddon-3.0\AceAddon-3.0.lua:482
orderedModules = {
}
localized = true
DisableModule = defined @ArcHUD3\Libs\AceAddon-3.0\AceAddon-3.0.lua:381
SpellcastInterrupt = defined @ArcHUD3\Rings\Casting.lua:268
SpellcastStop = defined @ArcHUD3\Rings\Casting.lua:224
spellStatus = "failed"
SpellcastSuccess = defined @ArcHUD3\Rings\Casting.lua:260
RegisterMessage = defined @ArcHUD3\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:116
UnregisterMessage = defined @ArcHUD3\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:179
UNIT_SPELLCAST_START = defined @ArcHUD3\Rings\Casting.lua:134
unit = "player"
UNIT_SPELLCAST_DELAYED = defined @ArcHUD3\Rings\Casting.lua:211
SpellcastChannelStop = defined @ArcHUD3\Rings\Casting.lua:247
UNIT_SPELLCAST_CHANNEL_UPDATE = defined @ArcHUD3\Rings\Casting.lua:197
IsModule = defined @ArcHUD3\Libs\AceAddon-3.0\AceAddon-3.0.lua:248
db = {
}
SetDefaultModuleState = defined @ArcHUD3\Libs\AceAddon-3.0\AceAddon-3.0.lua:418
OnModuleEnable = defined @ArcHUD3\Rings\Casting.lua:106
version = "2.1 (01920a3)"
SetEnabledState = defined @ArcHUD3\Libs\AceAddon-3.0\AceAddon-3.0.lua:455
disableEvents = {
}
enabledState = true
defaults = {
}
RegisterEvent = defined @ArcHUD3\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:116
UnregisterAllMessages = defined @ArcHUD3\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:200
noAutoAlpha = true
OnModuleUpdate = defined @ArcHUD3\Rings\Casting.lua:51
NewModule = defined @ArcHUD3\Libs\AceAddon-3.0\AceAddon-3.0.lua:266
IterateModules = defined @ArcHUD3\Libs\AceAddon-3.0\AceAddon-3.0.lua:468
SendMessage = defined @ArcHUD3\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:85
GetName = defined @ArcHUD3\Libs\AceAddon-3.0\AceAddon-3.0.lua:310
moduleName = "Casting"
UnregisterEvent = defined @ArcHUD3\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:179
Disable = defined @ArcHUD3\Libs\AceAddon-3.0\AceAddon-3.0.lua:345
}
event = "UNIT_SPELLCAST_START"
arg1 = "player"
spell = "Dalaran Hearthstone"
rank = "Da