Warning: array_merge

Hi,

I just saw this warning on my blog at http://www.motorparasi.com ;

”Warning: array_merge() [function.array-merge]: Argument #2 is not an array in /home/webusers/tanyak/motorparasi.com/www/wp-includes/widgets.php on line 53”

Does anyone know what might be causing this and how can I get rid of it?

Any help is appreciated.
Thx