Unlikely since I saw similar errors where the max is only 12 and many other different values (do a search, there are some posts here about them). That wouldn't make any sense because the maximum custom sounds cannot be altered through a cvar or anything.
It could be possible it crashed before printing out the wave extension...i still say he has a custom ubersound error causing the problem or the loading of to many aliases in ubersound..seen this error a couple thousand times and it always leads back to a altered ubersound problem.Trust me on this one? lol...i have a modified uberdialogue that removes all bot sounds..this allows you to add more custom sounds to multiplayer ..non-botted multiplayer maps that is:) Instread of using a altered ubersound you could use jvs sound fix or make the custom sounds map specific as a work around to bypass the error.