This happens to me since 8.2 release. Every time when i use Brackets on the Pet name, so it had color, i either don't see my messages, but other people can see it, or i see this error.
For time being i could just use 1.6.1 version of TRP3 but now even on 1.6.1 i see that error

Message: ...face\AddOns\totalRP3\modules\chatframe\chatframe.lua:460: attempt to call global 'configIncreaseNameColorContrast' (a nil value)
Time: Sun Jul 28 18:59:52 2019
Count: 4
Stack: ...face\AddOns\totalRP3\modules\chatframe\chatframe.lua:460: attempt to call global 'configIncreaseNameColorContrast' (a nil value)
...face\AddOns\totalRP3\modules\chatframe\chatframe.lua:460: in function <...face\AddOns\totalRP3\modules\chatframe\chatframe.lua:408>
...face\AddOns\totalRP3\modules\chatframe\chatframe.lua:503: in function <...face\AddOns\totalRP3\modules\chatframe\chatframe.lua:487>
...face\AddOns\totalRP3\modules\chatframe\chatframe.lua:554: in function filterFunc' Interface\AddOns\Prat-3.0\services\chatsections.lua:50: in function <Interface\AddOns\Prat-3.0\services\chatsections.lua:43> Interface\AddOns\Prat-3.0\services\chatsections.lua:320: in function SplitChatMessage'
Interface\AddOns\Prat-3.0\addon\addon.lua:590: in function <Interface\AddOns\Prat-3.0\addon\addon.lua:565>
(tail call): ?
Interface\FrameXML\ChatFrame.lua:3005: in function `ChatFrame_OnEvent'
[string ":OnEvent"]:1: in function <[string ":OnEvent"]:1>

Locals: name = "Shiersia"
senderID = "Dâedra-ArgentDawn"
chatColor =

{
class = {
}
}
nameColor = nil
petProfile = {
profileName = "Shiersia"
PE = {
}
data = {
}
links = {
}
}
innerName = "Shiersia"
customColor = {
class = {
}
}
(*temporary) = nil
(*temporary) = "attempt to call global 'configIncreaseNameColorContrast' (a nil value)"
disabledByOOC = defined @interface\AddOns\totalRP3\modules\chatframe\chatframe.lua:76
getConfigValue = defined @interface\AddOns\totalRP3\core\impl\configuration.lua:79
CONFIG_NPCSPEECH_REPLACEMENT = "chat_npcspeech_replacement"
Globals = {
addon_name_me = "TRP3: Extended"
player_icon = "Ability_Racial_EntropicEmbrace"
clients = {
}
player_class_loc = "Warlock"
player_race_loc = "Void Elf"
addon_name = "Total RP 3"
player_character = {
}
player_faction_loc = "Alliance"
is_trial_account = 0
PSYCHO_MAX_VALUE_V1 = 6
DEBUG_MODE = false
required_trp3_build = 66
icons = {
}
player = "Dâedra"
version = 72
addon_name_short = "TRP3"
PSYCHO_DEFAULT_VALUE_V2 = 10
player_id = "Dâedra-ArgentDawn"
PSYCHO_DEFAULT_RIGHT_COLOR = {
}
RELATIONS = {
}
PSYCHO_DEFAULT_VALUE_V1 = 3
build = defined @interface\AddOns\totalRP3\core\impl\globals.lua:129
RELATIONS_ORDER = {
}
player_hash = 4028887006
addon = {
}
extended_version = 1017
extended_display_version = "1.3.3"
version_display = "1.6.3.1"
player_realm = "Argent Dawn"
player_realm_id = "ArgentDawn"
player_class_index = 9
PSYCHO_MAX_VALUE_V2 = 20
empty = {
}
addon_name_extended = "TRP3: Extended"
PSYCHO_DEFAULT_LEFT_COLOR = {
}
addon_id_length = 15
}
TRP3_API = {
inventory = {
}
utils = {
}
MapDataProvider = {
}
CompanionProfileChatLinksModule = {
}
MapScannersManager = {
}
Locale = {
}
currently_frame = {
}
ChatLinks = {
}
map = {
}
Ellyb = {
}
r = {
}
slash = {
}
VERSION_DISPLAY = "1.6.3.1"
importer = {
}
ProfilesChatLinkModule = {
}
profile = {
}
popup = {
}
Events = {
}
BUILD_NUMBER = 798
AtFirstGlanceChatLinksModule = {
}
ADVANCED_SETTINGS_DEFAULT_VALUES = {
}
ChatLinkModule = {
}
RegisterPlayerChatLinksModule = {
}
module = {
}
RegisterCompanionChatLinksModule = {
}
extended = {
}
register = {
}
ADVANCED_SETTINGS_STRUCTURE = {
}
ChatLinkTooltipLines = {
}
target = {
}
chat = {
}
flyway = {
}
toolbar = {
}
security = {
}
globals = {
}
dashboard = {
}
getSafeValueFromTab