GuildGui1b

Error while running the chunk
  [string "Mods/Addons/GuildGui1b/Scripts/ScriptGuildGui1b.lua"]:1096: attempt to perform arithmetic on a nil value
  func: __mul, metamethod, line: -1, defined: C, line: -1, [C]
    func: OfflineTimeToDateTime, global, line: 1096, defined: Lua, line: 1061, [string "Mods/Addons/GuildGui1b/Scripts/ScriptGuildGui1b.lua"]
      func: LastOnline_CollectFriends, global, line: 1431, defined: Lua, line: 1421, [string "Mods/Addons/GuildGui1b/Scripts/ScriptGuildGui1b.lua"]
        func: OnEventAvatarCreated, global, line: 185, defined: Lua, line: 173, [string "Mods/Addons/GuildGui1b/Scripts/ScriptGuildGui1b.lua"]
          func: Init, global, line: 1789, defined: Lua, line: 1550, [string "Mods/Addons/GuildGui1b/Scripts/ScriptGuildGui1b.lua"]
            func: ?, ?, line: 1796, defined: main, line: 0, [string "Mods/Addons/GuildGui1b/Scripts/ScriptGuildGui1b.lua"]