[Plugin: curreX] array problem :-(

Warning: array_merge() [function.array-merge]: Argument #2 is not an array in /var/www/clients/client4/web21/web/wp-content/plugins/currex/curreX.php on line 457
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curreX v0.9 Settings

the widget gives this error in the backend

http://wordpress.org/extend/plugins/currex/