I found a small issue in the plugin when the DEBUG mode is enabled.
When I do a search for something that not exists on a page (try some random string) and DEBUG mode is enabled I get the following errors in the <title> tag:
Notice: Trying to get property of non-object in /Users/depi/Sites/apps/zmeskanyhovor2/wp-includes/category-template.php on line 1079
It happens when I use the %%searchphrase%% and the %%pagenumber%% tags in the title.
Should be fixed though.