Describe the bug
Bug appears intermittently when navigating the world.

To Reproduce

1. Walk to Cooking Daily quest giver in Dalaran
2. Hover over quest giver
3. See error

Expected behavior
No error

TipTac Reborn (please complete the following information):

• Version 23.01.23

WoW (please complete the following information):

• Flavor: Wrath
• Version 3.4.1

Additional context
Message: Interface/SharedXML/Color.lua:60: bad argument #2 to 'format' (string expected, got nil)
Time: Fri Jan 27 11:51:38 2023
Count: 20
Stack: Interface/SharedXML/Color.lua:60: bad argument #2 to 'format' (string expected, got nil)
[string "=[C]"]: ?
[string "=[C]"]: in function format' [string "@Interface/SharedXML/Color.lua"]:60: in function <Interface/SharedXML/Color.lua:59> [string "=(tail call)"]: ? [string "@Interface/AddOns/TipTac/ttStyle.lua"]:229: in function GeneratePlayerLines'
[string "@Interface/AddOns/TipTac/ttStyle.lua"]:338: in function ModifyUnitTooltip' [string "@Interface/AddOns/TipTac/ttStyle.lua"]:470: in function ?'
[string "@Interface/AddOns/TipTac/libs/LibFroznFunctions-1.0/LibFroznFunctions-1.0.lua"]:688: in function FireGroupEvent' [string "@Interface/AddOns/TipTac/ttCore.lua"]:2238: in function SetUnitAppearanceToTip'
[string "@Interface/AddOns/TipTac/ttCore.lua"]:2319: in function <Interface/AddOns/TipTac/ttCore.lua:2278>
[string "=[C]"]: ?
[string "=[C]"]: ?

Locals:

Does not always happen at this quest giver.

Seems a little strange to me that the error occures in function GeneratePlayerLines() because it's a NPC. I walked to the quest giver and got no error if hovering over this unit.

But in the case UnitRace() doesn't return a valid race, the error you mentioned occures. So I added a check for this case. This will be included in the next release. 👍

It is random and maybe a player walked under my cursor. It happened later just walking around Dalaran, I didn't notice who my mouse was on.