Holy QA Batman! Ouch!
This is a simple fix and I'm going to "slip it in" as a new version of the 5.0.3 code.
So ... faced with the choice of rolling out a whole new 5.0.4 release 20 hours after the 5.0.3 release, or just releasing the new code as 5.0.3 on top of the real 5.0.3 ... I'm chosing the latter.