WowAce

4x bad argument #1 to '?' (Usage: local definitionInfo = C_Traits.GetDefinitionInfo(definitionID))
[string "=[C]"]: in function `GetDefinitionInfo'
[string "@LibGroupInSpecT-1.1-95/LibGroupInSpecT-1.1.lua"]:348: in function `GetCachedTalentInfoByID'
[string "@LibGroupInSpecT-1.1-95/LibGroupInSpecT-1.1.lua"]:602: in function `BuildInfo'
[string "@LibGroupInSpecT-1.1-95/LibGroupInSpecT-1.1.lua"]:657: in function `eventhandler'
[string "@LibGroupInSpecT-1.1-95/LibGroupInSpecT-1.1.lua"]:131: in function <...eLibGroupInSpecT-1.1/LibGroupInSpecT-1.1.lua:129>

Locals:
(*temporary) = "bad argument #1 to '?' (Usage: local definitionInfo = C_Traits.GetDefinitionInfo(definitionID))"

Not just Dornogal, seems like any new content.  Have not checked older content, but it occurs when you target or mouseover other players (but possibly not all the time because consistency would be useful.)