What steps will reproduce the problem?
1. Do a dungeon

Do you have an error log of what happened?
36x Skada\modules\Debuffs.lua:153 Division by zero
Skada\modules\Debuffs.lua:153 in function <Skada\modules\Debuffs.lua:125
Skada\modules\Debuffs.lua:215 in function `Update'
Skada\Skada-r570.lua:1842 in function `?'
...faceGrid2\Libs\AceTimer-3.0\AceTimer-3.0-16.lua:41 in function <...faceGrid2\Libs\AceTimer-3.0\AceTimer-3.0.lua:36

Locals:
self = <table> {
 SetDefaultModuleLibraries = <function> defined @Masque\Libs\AceAddon-3.0\AceAddon-3.0.lua:398
 Enable = <function> defined @Masque\Libs\AceAddon-3.0\AceAddon-3.0.lua:325
 NewModule = <function> defined @Masque\Libs\AceAddon-3.0\AceAddon-3.0.lua:266
 Update = <function> defined @Skada\modules\Debuffs.lua:214
 EnableModule = <function> defined @Masque\Libs\AceAddon-3.0\AceAddon-3.0.lua:363
 modules = <table> {
 }
 GetModule = <function> defined @Masque\Libs\AceAddon-3.0\AceAddon-3.0.lua:241
 IterateEmbeds = <function> defined @Masque\Libs\AceAddon-3.0\AceAddon-3.0.lua:473
 IsModule = <function> defined @Masque\Libs\AceAddon-3.0\AceAddon-3.0.lua:248
 defaultModuleLibraries = <table> {
 }
 SetEnabledState = <function> defined @Masque\Libs\AceAddon-3.0\AceAddon-3.0.lua:455
 baseName = "Blizzard_CombatLog"
 enabledState = true
 scanned = true
 defaultModuleState = true
 moduleName = "Buff uptimes"
 GetName = <function> defined @Masque\Libs\AceAddon-3.0\AceAddon-3.0.lua:310
 metadata = <table> {
 }
 Disable = <function> defined @Masque\Libs\AceAddon-3.0\AceAddon-3.0.lua:345
 IterateModules = <function> defined @Masque\Libs\AceAddon-3.0\AceAddon-3.0.lua:468
 name = "Skada_Buff uptimes"
 SetDefaultModulePrototype = <function> defined @Masque\Libs\AceAddon-3.0\AceAddon-3.0.lua:440
 IsEnabled = <function> defined @Masque\Libs\AceAddon-3.0\AceAddon-3.0.lua:482
 orderedModules = <table> {
 }
 SetDefaultModuleState = <function> defined @Masque\Libs\AceAddon-3.0\AceAddon-3.0.lua:418
 DisableModule = <function> defined @Masque\Libs\AceAddon-3.0\AceAddon-3.0.lua:381
}
win = <table> {
 changed = false
 metadata = <table> {
 }
 selectedset = "current"
 dataset = <table> {
 }
 selectedmode = <table> {
 }
 bargroup = SkadaBarWindowSkada {
 }
 db = <table> {
 }
 usealt = true
 display = <table> {
 }
 history = <table> {
 }
}
set = <table> {
 orbhealingabsorbed = 0
 orbburstcast = 0
 _playeridx = <table> {
 }
 starttime = 1411889104
 power = <table> {
 }
 dispells = 0
 multistrikes = 0
 ccbreaks = 0
 time = 0
 interrupts = 0
 healingabsorbed = 0
 overhealing = 0
 shielding = 0
 damage = 234012
 players = <table> {
 }
 deaths = 0
 mobs = <table> {
 }
 mobtaken = 234012
 orbhealing = 0
 healing = 0
 orbsummon = 0
 orboverhealing = 0
 orbbursthits = <table> {
 }
 orbpickuphits = <table> {
 }
 name = "Current fight"
 mobname = "Rabbit"
 damagetaken = 0
 mobhdone = 0
 last_action = 1411889104
 mobdone = 0
}
updatefunc = <function> defined @Skada\modules\Debuffs.lua:125

Please provide any additional information below.