non existing word found by MC

[Robert Brenstein]

I just discovered a truly bizarre glitch that it took me loooong time 
to nail down. It was just something so unexpected that I kept 
overlooking it.

I have a text that is dynamically assembled from extracting data from 
database queries. At the end, I check whether anywhere along the way 
a SQL error was reported. When that happens, the error message is in 
the output string, so I simply do

if "error" is among words of lst then

which gives me a false positive in 1 case (no problem for 95 other 
cases). Really unbelievable but if I look at the text itself, there 
is NO 'error' in it. I confirm this direct observation by

answer wordOffset("error",lst) & slash & (the number of words of lst)

I get: 17/15

This is with 2.6.1 engine (OS9). For now, I supplemented my test to 
skip over this bogus result if word offset is bigger than number of 
words, but this should not be happening.

Has anyone seen anything like this? It surely looks that engine is 
checking beyond the string boundary.

Robert Brenstein