WowAce

What version of Grid2 and game type (classic or retail) are you using ?

retail

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

windows 

What steps will reproduce the problem?

When I edit the Icon setting and Buff TEST. 
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?

 idk :(

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).

3x Grid2\modules\IndicatorTooltip.lua:55: attempt to call method 'GetTooltip' (a nil value)
[string "@Grid2\modules\IndicatorTooltip.lua"]:55: in function `Display'
[string "@Grid2\modules\IndicatorTooltip.lua"]:31: in function `func'
[string "@Grid2\GridFrame.lua"]:92: in function <Grid2\GridFrame.lua:90>

Locals:
self = <table> {
LoadDB = <function> defined @Grid2\modules\IndicatorTooltip.lua:82
Update = <function> defined @Grid2\GridIndicator.lua:44
statuses = <table> {
}
prototype = <table> {
}
Layout = <function> defined @Grid2\GridUtils.lua:14
Create = <function> defined @Grid2\GridUtils.lua:14
dbx = <table> {
}
OnSuspend = <function> defined @Grid2\modules\IndicatorTooltip.lua:77
sortStatuses = <function> defined @Grid2\GridIndicator.lua:25
name = "tooltip"
priorities = <table> {
}
Display = <function> defined @Grid2\modules\IndicatorTooltip.lua:48
GetTooltip = <function> defined @Grid2\modules\IndicatorTooltip.lua:44
OnUpdate = <function> defined @Grid2\modules\IndicatorTooltip.lua:67
Hide = <function> defined @Grid2\modules\IndicatorTooltip.lua:60
}
unit = "player"
status = <table> {
GetPercent = <function> defined @Grid2Options\GridIndicators.lua:224
indicators = <table> {
}
GetIcons = <function> defined @Grid2Options\GridIndicators.lua:226
IsActive = <function> defined @Grid2Options\GridIndicators.lua:221
GetText = <function> defined @Grid2Options\GridIndicators.lua:222
priorities = <table> {
}
GetColor = <function> defined @Grid2Options\GridIndicators.lua:223
enabled = true
name = "test"
GetIcon = <function> defined @Grid2Options\GridIndicators.lua:225
}
anchor = nil
(*temporary) = nil
(*temporary) = <table> {
GetPercent = <function> defined @Grid2Options\GridIndicators.lua:224
indicators = <table> {
}
GetIcons = <function> defined @Grid2Options\GridIndicators.lua:226
IsActive = <function> defined @Grid2Options\GridIndicators.lua:221
GetText = <function> defined @Grid2Options\GridIndicators.lua:222
priorities = <table> {
}
GetColor = <function> defined @Grid2Options\GridIndicators.lua:223
enabled = true
name = "test"
GetIcon = <function> defined @Grid2Options\GridIndicators.lua:225
}

I cannot reproduce this issue, you could send me your profile in text format (General/Profiles/Import&Export/Export Profile option).