Out of memory errors on 30 000 posts blogs

When searching for something that gives a larger result set, PHP sends an “Fatal error: Allowed memory size of xxxxxx bytes exhausted”

This error does not occur when the plug-in is disabled.

This is on a blog with some 30 000+ posts, but since standard search can manage this volume, gSearch should be possible to fix as well.

http://wordpress.org/extend/plugins/gsearch-plus/