Why am I getting this error on the client side when I run my game?

20:51:55 -- CoreGui.RobloxGui.Modules.FlayerList.Reducers.PlayerIconInfo:45: attempt to index nil with 'avatarIcon' Stack Begin Script 'CoreGui.RobloxGui.ModulEs.FlayerList.Reducers.PlayerIconInfo', Line 45 Script 'CorePackages.Packages._Index.roblox_rodux.-odux.createReducer', Line 10 Script 'CorePackages.Packages._Index.roblox_rodux.-odux.combineReducers', Line 15 Script 'CorePackages.Packages._Index.roblox_rodux.-odux.Store', Line 89 - function dispatch Script 'CorePackages.Packages._Index.roblox_rodux.-odux.Store', Line 53 Script 'CorePackages.Packages._Index.roblox_rodux.-odux.thunkMiddleware', Line 12 Script 'CorePackages.Packages._Index.roblox_rodux.rodux.Store', Line 62 Script 'CoreGui.RobloxGui.Modules.PlayerList.Thunks.MakePlayerInfoRequests', Line 58 - function getGameCreator Stack End