I am working on an MBA (2011).
When the search field is blank and inactive (no flashing cursor, as per the screenshot below), a three fingered tap via the trackpad results in a repeatable crash,

I appreciate that the answer is don't execute a three fingered tap when the search field is deselected, but thought you might want to know
.
I have uploaded the logs for your information.
Please let me know if you need anything further.
7450.Archive.zip