In the latest for Classic I'm getting the following error when a mob that is outside of nameplate range casts a spell:

Message: Interface\AddOns\NeatPlates\NeatPlatesCore.lua:1176: attempt to index field 'castnostop' (a nil value)
Time: Sun Oct 11 22:25:19 2020
Count: 10
Stack: Interface\AddOns\NeatPlates\NeatPlatesCore.lua:1176: attempt to index field 'castnostop' (a nil value)
Interface\AddOns\NeatPlates\NeatPlatesCore.lua:1176: in function <Interface\AddOns\NeatPlates\NeatPlatesCore.lua:1101>
Interface\AddOns\NeatPlates\NeatPlatesCore.lua:1622: in function `?'
Interface\AddOns\NeatPlates\NeatPlatesCore.lua:1365: in function <Interface\AddOns\NeatPlates\NeatPlatesCore.lua:1364>

Locals: plate = NeatPlatesTarget {
carrier = NeatPlatesCarrier-1 {
}
0 =
extended = {
}
unitGUID = "Creature-0-4412-1-66-6202-000003CC13"
}
guid = "Creature-0-4412-1-66-6202-000003CC13"
channeled = false
castBar = {
0 =
Right = 1
Left = 0
SetAllColors = defined @interface\AddOns\NeatPlates\NeatPlatesStatusbar.lua:53
SetStatusBarColor = defined @interface\AddOns\NeatPlates\NeatPlatesStatusbar.lua:40
SetOrientation = defined @interface\AddOns\NeatPlates\NeatPlatesStatusbar.lua:60
Value = 732580846
SetMinMaxValues = defined @interface\AddOns\NeatPlates\NeatPlatesStatusbar.lua:80
durationtext = {
}
SetTexCoord = defined @interface\AddOns\NeatPlates\NeatPlatesStatusbar.lua:97
GetMinMaxValues = defined @interface\AddOns\NeatPlates\NeatPlatesStatusbar.lua:75
Bottom = 1
MaxVal = 732583855
SetBackdropTexture = defined @interface\AddOns\NeatPlates\NeatPlatesStatusbar.lua:106
Backdrop = {
}
SetBackdropTexCoord = defined @interface\AddOns\NeatPlates\NeatPlatesStatusbar.lua:102
Top = 0
MinVal = 732580846
Dim = 1
SetStatusBarTexture = defined @interface\AddOns\NeatPlates\NeatPlatesStatusbar.lua:39
Orientation = "HORIZONTAL"
SetStatusBarGradient = defined @interface\AddOns\NeatPlates\NeatPlatesStatusbar.lua:41
SetValue = defined @interface\AddOns\NeatPlates\NeatPlatesStatusbar.lua:34
Bar = {
}
}
unitType = "Creature"
_ = "0"
_ = "4412"
_ = "1"
_ = "66"
creatureID = "6202"
spell =

It doesn't occur when the mob has a nameplate.

I wasn't able to replicate this in my own testing, but I've released a fix that should resolve the issue and will be available shortly on curse.

Sadly the error is still there.

Ah, think I misread what the error actually said. I'll push a new release again and if this still doesn't fix it I'll have to spend some more time trying to replicate the issue.

Getting this Error aswell now.
WoW Classic 1.13.5 (36035)

Date: 2020-10-12 09:09:59
ID: 1
Error occured in: Global
Count: 1
Message: ..\AddOns\NeatPlates\NeatPlatesCore.lua line 1176:
attempt to index field 'castnostop' (a nil value)
Debug:
[C]: ?
NeatPlates\NeatPlatesCore.lua:1176:
NeatPlates\NeatPlatesCore.lua:1101
NeatPlates\NeatPlatesCore.lua:1622: ?()
NeatPlates\NeatPlatesCore.lua:1365:
NeatPlates\NeatPlatesCore.lua:1364
Locals:

AddOns:
Swatter, v8.2.6377 (SwimmingSeadragon)
AtlasLootClassic, vv1.5.6
AtlasLootClassicData, vv1.5.6
AtlasLootClassicDungeonsAndRaids, vv1.5.6
AucAdvanced, v8.2.6430 (SwimmingSeadragon)
AucFilterBasic, v8.2.6364 (SwimmingSeadragon)
AucStatHistogram, v8.2.6366 (SwimmingSeadragon)
AucStatiLevel, v8.2.6370 (SwimmingSeadragon)
AucStatPurchased, v8.2.6367 (SwimmingSeadragon)
AucStatSimple, v8.2.6399 (SwimmingSeadragon)
AucStatStdDev, v8.2.6369 (SwimmingSeadragon)
AucUtilFixAH, v8.2.6371 (SwimmingSeadragon)
BagBrother, v
Bagnon, v9.0.1
Bartender4, v4.9.0
BeanCounter, v8.2.6434 (SwimmingSeadragon)
CharacterStatsClassic, v3.6.5
ClassicAuraDurations, v1.13.61
ClassicCastbars, v1.3.12
ClassicCastbarsOptions, v
ClickMorph, v1.6.4
DBMCore, v1.13.61
DBMDefaultSkin, v
DBMStatusBarTimers, v
Decursive, v2.7.7
DruidBarClassic, v0.7.8
EnchantrixBarker, v8.2.6469 (SwimmingSeadragon)
GatherMate2, v1.45.5
HealBot, v1.13.5.6
HealBotData, v1.13.5.6
HealBoten, v1.13.5.6
HealBotExtraSkins, v1.13.5.6
HealBotOptions, v1.13.5.6
HealBotTips, v1.13.5.6
Informant, v8.2.6374 (SwimmingSeadragon)
ItemRack, v
LeatrixMaps, v1.13.81
LeatrixPlus, v1.13.81
ModernTargetFrame, v1.8
NeatPlates, v1.13.5.13
NeatPlatesAlvara, v5a
NeatPlatesBlizzardPlates, v2.0
NeatPlatesClassicPlates, v
NeatPlatesGraphite, v
NeatPlatesGrey, v
NeatPlatesNeon, v
NeatPlatesQuatre, v
NeatPlatesRenaitre, vv7.0.3
NeatPlatesRoth, v
NeatPlatesSimple, v7.3.0
NeatPlatesSlimHorizontal, v2.2
NeatPlatesSlimVertical, v2.2
NeatPlatesHub, v
NeatPlatesWidgets, v
NovaWorldBuffs, v1.82
OmniBar, vv10.8
OmniCC, v8.3.6
Quartz, v3.5-classic-5
QuartzProcs, v3.6
Questie, v6.0.5
SaladCthun, v1.01
Spy, v1.1.2
Stubby, v8.2.6376 (SwimmingSeadragon)
unitscan, v1.0.3
WeakAuras, v2.18.4
BlizRuntimeLib_enUS v1.13.5.11305
(ck=763)

To me that last update seems to have fixed it, the lua error is not popping up anymore for me. (tested on like 40 mobs)
If i am wrong and get the popup again in next days i will post an update.

Correct, .15 seemed to fix the lua errors.

.15 has no more errors, thanks!