'arbtt-stats: Prelude.(!!): index too large' when running arbtt-stats

[Jason Mule]

I get this error when I run arbtt-stats 0.9.0.4 after running
arbtt-capture. My categorize.cfg has a single line:
$idle > 30 ==> tag inactive

I have omitted the capture log due to privacy reasons.  Any help/ ideas
towards resolving this will be appreciated.
--
Jason
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