Need Help about Lang Select

[eluser]Đỗ Thanh Tùng[/eluser]

Code:

A PHP Error was encountered
Severity: Warning

Message: array_key_exists() [function.array-key-exists]: The first argument should be either a string or an integer

Filename: libraries/Lang_detect.php

Line Number: 193

My Website work perfect on http://localhost but when i change to http://192.168.10.5 (my Ip Address on LAN) and i got that Warning. What can i do to fix it. Thanks very much.