Polish characters are unallowed in argument?

[eluser]rockstyle[/eluser]
I've got this error, but as a looked into the code it appears that polish characters are disallowed. I've got this in routes:

Code:

$route['zatwierdzone'] = "home/index/zatwierdzone";
$route['oczekujace'] = "home/index/oczekujące";
$route['odrzucone'] = "home/index/odrzucone";

It works but only for the first and for the last. It shows me an error when i'm trying to get to the second called oczekujące. I can also tell that oczekujace is record from column title.

ERROR:

Code:

A PHP Error was encountered

Severity: Notice

Message: Trying to get property of non-object

Filename: views/forum_list.php

Line Number: 3
A PHP Error was encountered

Severity: Notice

Message: Trying to get property of non-object

Filename: views/forum_list.php

Line Number: 5
A PHP Error was encountered

Severity: Warning

Message: Invalid argument supplied for foreach()

Filename: views/forum_list.php

Line Number: 5