WowAce

What version of Grid2 are you using?

r916 

What game client version (windows or mac) and language are you using ?

Windows

What steps will reproduce the problem?

Have pet frames showing and get into a few fights.  At some point the health bar will not move or show incorrect health deficit

 
Did you try having Grid2 as the only enabled addon and everything else disabled?

Yes

Was it working in a previous version? If yes, which was the last good one?

First time trying to use it with classic, but retail version works fine.

Do you have an error log of what happened? If you don't see any errors, make sure that error reporting is enabled (`/console scriptErrors 1`) or install [BugSack](https://mods.curse.com/addons/wow/BugSack).

Please provide any additional information below.

I cannot check this issue yet (i have no class with pet in classic).  Maybe in a few weeks i will be able to level a hunter to at least level 10 to get a pet.

Anyways for the game and addons pets and players units are the same,  so if some unit shows incorrect health probably will be a game issue, not an addon issue.

I also have this problem, pets work fine on default Blizzard raidframes but always appear at full HP on Grid. 

@Michaelsp, if it helps you can do the Warlock imp quest at lv4. Here are my error messages:

Message: Interface\AddOns\Grid2\modules\StatusColor.lua:118: attempt to call upvalue 'UnitHasVehicleUI' (a nil value)
Time: Sat Sep 7 20:47:17 2019
Count: 3
Stack: Interface\AddOns\Grid2\modules\StatusColor.lua:118: attempt to call upvalue 'UnitHasVehicleUI' (a nil value)
Interface\AddOns\Grid2\modules\StatusColor.lua:118: in function `IsActive'
Interface\AddOns\Grid2\GridIndicator.lua:84: in function `GetCurrentStatus'
Interface\AddOns\Grid2\GridIndicator.lua:94: in function `Update'
Interface\AddOns\Grid2\GridFrame.lua:170: in function `UpdateIndicators'
Interface\AddOns\Grid2\GridFrame.lua:79: in function <Interface\AddOns\Grid2\GridFrame.lua:71>
[C]: in function `SetAttribute'
Interface\FrameXML\SecureGroupHeaders.lua:203: in function <Interface\FrameXML\SecureGroupHeaders.lua:123>
Interface\FrameXML\SecureGroupHeaders.lua:623: in function <Interface\FrameXML\SecureGroupHeaders.lua:530>
[C]: in function `Show'
Interface\AddOns\Grid2\GridLayout.lua:571: in function `ForceFramesCreation'
Interface\AddOns\Grid2\GridLayout.lua:518: in function `FixHeaderAttributes'
Interface\AddOns\Grid2\GridLayout.lua:443: in function `AddHeader'
...
[C]: ?
...id2\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:29: in function <...id2\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:25>
...id2\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:64: in function `SendMessage'
Interface\AddOns\Grid2\GridRoster.lua:230: in function `GroupChanged'
Interface\AddOns\Grid2\GridRoster.lua:181: in function `?'
...id2\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:119: in function <...id2\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:119>
[C]: ?
...id2\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:29: in function <...id2\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:25>
...id2\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:64: in function `Fire'
...face\AddOns\Grid2\Libs\AceEvent-3.0\AceEvent-3.0.lua:120: in function <...face\AddOns\Grid2\Libs\AceEvent-3.0\AceEvent-3.0.lua:119>

Locals: self = <table> {
GetPercent = <function> defined @Interface\AddOns\Grid2\modules\StatusColor.lua:128
UpdateUnit = <function> defined @Interface\AddOns\Grid2\modules\StatusColor.lua:30
indicators = <table> {
}
RegisterMessage = <function> defined @Interface\AddOns\Grid2\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:90
UnregisterAllEvents = <function> defined @Interface\AddOns\Grid2\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:174
GetText = <function> defined @Interface\AddOns\Grid2\modules\StatusColor.lua:124
GetColor = <function> defined @Interface\AddOns\Grid2\GridUtils.lua:152
SendMessage = <function> defined @Interface\AddOns\Grid2\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:59
dbx = <table> {
}
OnDisable = <function> defined @Interface\AddOns\Grid2\modules\StatusColor.lua:43
RegisterEvent = <function> defined @Interface\AddOns\Grid2\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:90
UnregisterAllMessages = <function> defined @Interface\AddOns\Grid2\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:174
IsActive = <function> defined @Interface\AddOns\Grid2\modules\StatusColor.lua:116
OnEnable = <function> defined @Interface\AddOns\Grid2\modules\StatusColor.lua:36
name = "charmed"
enabled = true
UnregisterEvent = <function> defined @Interface\AddOns\Grid2\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:153
UnregisterMessage = <function> defined @Interface\AddOns\Grid2\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:153
}
unit = "partypet4"
owner = "party4"
(*temporary) = nil
(*temporary) = "party4"
(*temporary) = "attempt to call upvalue 'UnitHasVehicleUI' (a nil value)"
Grid2 = <table> {
CreateLocation = <function> defined @Interface\AddOns\Grid2\GridUtils.lua:138
EnableModules = <function> defined @Interface\AddOns\Grid2\GridCore.lua:81
WakeUpIndicator = <function> defined @Interface\AddOns\Grid2\GridIndicator.lua:107
modules = <table> {
}
CancelTimer = <function> defined @Interface\AddOns\Grid2\GridUtils.lua:55
sta

The error posted by rosuto4u was fixed in version r917.