Charts stop converting from null to 9ms if a chart throws an exception

[angelolz]

Here's my program output:

The problem simfile can be retrieved from here: https://zenius-i-vanisher.com/v5.2/viewsimfile.php?simfileid=47853

[telperion]

excellent report - and the simfile in question doesn't even have an #OFFSET tag, so now I've learned that's a case that exists :P