ZannGrid

Error while running the chunk
  [string "Mods/Addons/ZannGrid/Scripts/GridEx.lua"]:1684: attempt to compare number with nil
  func: __lt, metamethod, line: -1, defined: C, line: -1, [C]
    func: registerAllEvents, global, line: 1684, defined: Lua, line: 1635, [string "Mods/Addons/ZannGrid/Scripts/GridEx.lua"]
      func: InitAvatar, global, line: 83, defined: Lua, line: 62, [string "Mods/Addons/ZannGrid/Scripts/GridEx.lua"]
        func: Init, global, line: 1757, defined: Lua, line: 1716, [string "Mods/Addons/ZannGrid/Scripts/GridEx.lua"]
          func: ?, ?, line: 1762, defined: main, line: 0, [string "Mods/Addons/ZannGrid/Scripts/GridEx.lua"]