Player class is not saved in cache in between playing sessions

[K0lonel]

Disabled all addons except tidyplates/tidyplates_threat, after logout or game restart the cache is wiped.
Inside TidyPlates_ThreatPlates.lua:

ThreatPlatesDB = {
       ["friendlyNameOnly"] = true,
       ["cache"] = {},
       ["friendlyClass"] = true,
       ["cacheClass"] = true
}

Inside TidyPlates.lua:

TidyPlatesData = {
	["Friends"] = {
	},
	["UnitDescriptions"] = {
	},
	["Guild"] = {
	},
	["CachedAuraDurations"] = {
	},
	["UnitClass"] = {
	},
}