Hi @Chris D .. I understand what you are saying, but unfortunately, I am receiving this error quite regularly (5-10 times each day). So, while trying to reproduce it myself (I couldn't so far), I noticed that ["url"] portion of the Request state is common each time, though the ["referrer"] are different each time.
Is it possible that the error is related to the Chat addon? I don't find any trace of the addon in Stack trace though.