The google spider is picking up the onclick parameters for tracking. it sees what looks like a real URL, so it tries to crawl it and it results in a 404 because it is artificial to track virtual URLs.
The easiest solution is to change your onclick code to make this an array of text elements that you then join with "/" just prior to the trackpageview call.
For example what today looks like this?
business phone systems
can now look like this: