What steps will reproduce the problem?
1. Log on to a guardian druid
2. Use Incarnation: Son of Ursoc or Incarnation: King of the Jungle
3. Fight something

What is the expected output? What do you see instead?
Expected output would be no CDs (for Son of Ursoc) and no errors for either.  See instead errors whenever you cast any spell for the duration of the CD.

What version of the product are you using?
v0.7-3-gdb26236-nolib

Do you have an error log of what happened?  (Also popped one referencing line 133 instead of 145.)
24x SexyCooldown-v0.7-3-gdb26236\Modules\Spells-Spells.lua:145 attempt to concatenate local "id" (a nil value)
SexyCooldown-v0.7-3-gdb26236\Modules\Spells-Spells.lua:145 in function "UpdateSpellCooldowns"
SexyCooldown-v0.7-3-gdb26236\Modules\Spells-Spells.lua:103 in function "Refresh"
SexyCooldown-v0.7-3-gdb26236\Modules\Spells-Spells.lua:55 in function <SexyCooldown\Modules\Spells.lua:54

Locals:
self = <table> {
 SetDefaultModuleLibraries = <func> @Ace3\..\AceAddon-3.0.lua:383
 UpdateSpellCooldowns = <func> @SexyCooldown\Modules\Spells.lua:124
 SPELL_UPDATE_COOLDOWN = <func> @SexyCooldown\Modules\Spells.lua:86
 Enable = <func> @Ace3\..\AceAddon-3.0.lua:315
 UnregisterAllEvents = <func> @Ace3\..\CallbackHandler-1.0.lua:202
 EnableModule = <func> @Ace3\..\AceAddon-3.0.lua:348
 modules = <table> {}
 GetModule = <func> @Ace3\..\AceAddon-3.0.lua:231
 IterateEmbeds = <func> @Ace3\..\AceAddon-3.0.lua:458
 defaultModuleLibraries = <table> {}
 CleanupCooldowns = <func> @SexyCooldown\Modules\Spells.lua:109
 UNIT_SPELLCAST_SUCCEEDED = <func> @SexyCooldown\Modules\Spells.lua:92
 SetDefaultModulePrototype = <func> @Ace3\..\AceAddon-3.0.lua:425
 name = "SexyCooldown_Spells"
 IsEnabled = <func> @Ace3\..\AceAddon-3.0.lua:467
 orderedModules = <table> {}
 DisableModule = <func> @Ace3\..\AceAddon-3.0.lua:366
 InternalCooldowns_TalentProc = <func> @SexyCooldown\Modules\Spells.lua:72
 RegisterMessage = <func> @Ace3\..\CallbackHandler-1.0.lua:118
 UnregisterMessage = <func> @Ace3\..\CallbackHandler-1.0.lua:181
 IsModule = <func> @Ace3\..\AceAddon-3.0.lua:238
 baseName = "SexyCooldown"
 SetDefaultModuleState = <func> @Ace3\..\AceAddon-3.0.lua:403
 CacheSpells = <func> @SexyCooldown\Modules\Spells.lua:161
 CleanupSpellCooldowns = <func> @SexyCooldown\Modules\Spells.lua:152
 SetEnabledState = <func> @Ace3\..\AceAddon-3.0.lua:440
 Refresh = <func> @SexyCooldown\Modules\Spells.lua:102
 enabledState = true
 Disable = <func> @Ace3\..\AceAddon-3.0.lua:330
 RegisterEvent = <func> @Ace3\..\CallbackHandler-1.0.lua:118
 UnregisterAllMessages = <func> @Ace3\..\CallbackHandler-1.0.lua:202
 OnEnable = <func> @SexyCooldown\Modules\Spells.lua:62
 OnInitialize = <func> @SexyCooldown\Modules\Spells.lua:28
 NewModule = <func> @Ace3\..\AceAddon-3.0.lua:256
 IterateModules = <func> @Ace3\..\AceAddon-3.0.lua:453
 defaultModuleState = true
 SendMessage = <func> @Ace3\..\CallbackHandler-1.0.lua:87
 GetName = <func> @Ace3\..\AceAddon-3.0.lua:300
 moduleName = "Spells"
 UnregisterEvent = <func> @Ace3\..\CallbackHandler-1.0.lua:181
 UNIT_SPELLCAST_FAILED = <func> @SexyCooldown\Modules\Spells.lua:78
}
mod = <table> {
 SetDefaultModuleLibraries = <func> @Ace3\..\AceAddon-3.0.lua:383
 UpdateSpellCooldowns = <func> @SexyCooldown\Modules\Spells.lua:124
 SPELL_UPDATE_COOLDOWN = <func> @SexyCooldown\Modules\Spells.lua:86
 Enable = <func> @Ace3\..\AceAddon-3.0.lua:315
 UnregisterAllEvents = <func> @Ace3\..\CallbackHandler-1.0.lua:202
 EnableModule = <func> @Ace3\..\AceAddon-3.0.lua:348
 modules = <table> {}
 GetModule = <func> @

Please provide any additional information below.
Initially thought it might be tied to Son of Ursoc's weird way of effectively removing the CD on all bear abilities, but King of the Jungle triggers it too and the cat version doesn't change CDs at all.  Presumably affects the resto and boomkin versions, but I don't have any druids of either of those two specs.