Happens during logon and zone changes:

5x Ovale\dist\Cooldown.lua:241: attempt to perform arithmetic on field 'duration' (a nil value)
Ovale\dist\Cooldown.lua:241: in function GetCD' Ovale\dist\Cooldown.lua:162: in function GetSpellCooldown'
Ovale\dist\conditions.lua:1879: in function <Ovale\dist\conditions.lua:1869>
(tail call): ?
Ovale\dist\BestAction.lua:520: in function visitor' Ovale\dist\BestAction.lua:804: in function RecursiveCompute'
Ovale\dist\BestAction.lua:781: in function PostOrderCompute' Ovale\dist\BestAction.lua:752: in function <Ovale\dist\BestAction.lua:742> (tail call): ? Ovale\dist\BestAction.lua:507: in function visitor'
Ovale\dist\BestAction.lua:804: in function RecursiveCompute' Ovale\dist\BestAction.lua:781: in function PostOrderCompute'
Ovale\dist\BestAction.lua:752: in function <Ovale\dist\BestAction.lua:742>
(tail call): ?
Ovale\dist\BestAction.lua:733: in function `GetAction'
Ovale\dist\Frame.lua:150: in function <Ovale\dist\Frame.lua:121>
(tail call): ?

Locals:
self =

{
gcd = {
}
current = {
}
next = {
}
SaveSpellcastInfo = defined @ovale\dist\Cooldown.lua:309
RequireCooldownHandler = defined @ovale\dist\Cooldown.lua:319
sharedCooldown = {
}
enabled = false
serial = 2
CopySpellcastInfo = defined @ovale\dist\Cooldown.lua:304
}
spellId = "neltharions_fury"
atTime = 325563.515
cdName = "neltharions_fury"
si = nil
cd = {
start = -0.2
serial = 2
}
now = 325563.515
(*temporary) = -0.2
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = "attempt to perform arithmetic on field 'duration' (a nil value)"
__exports = {
OvaleCooldown = {
}
CooldownData = {
}
}
OvaleData = {
TAUREN_CLASSES = {
}
PANDAREN_CLASSES = {
}
BLOODELF_CLASSES = {
}
spellInfo = {
}
itemList = {
}
STAT_SHORTNAME = {
}
buffSpellList = {
}
STAT_NAMES = {
}
DEFAULT_SPELL_LIST = {
}
itemInfo = {
}
STAT_USE_NAMES = {
}
}
COOLDOWN_THRESHOLD = 0.1
GetSpellCharges = defined =[C]:-1