Advanced Search and htmlentities issue

When testing Gallery 2 Beta on one of my webservers I'm getting an error when using the advanced search link on the main page. I get the following error when I initially click to start an advanced search:
"Warning: htmlentities() expects parameter 1 to be string, array given in /usr/home/ian/public_html/gallery/modules/core/classes/GalleryUrlGenerator.class on line 680".

If I enter a search query and submit it, everything comes out fine.

The page renders fine in Mozilla, aside from the error, but looks really bad in IE.

Any ideas?
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Gallery version: 2.0beta
Webserver (with version): Apache/1.3.33
Datatabase (with version): MySQL 4.0.20
PHP version (eg 4.2.1): 4.3.10
Operating system: FreeBSD
Web browser/version: Mozilla 1.7.5 and IE6
G1 version (for migration bugs):

Yeup.

I've just disabled the link until the bug is closed/resolved

Thanks for the information.