Database failed to process. Divide by zero error encountered running sp_BlitzIndex
That's my bug! It's in the statistics gathering portion. If you search for the line:

CASE WHEN si.rowmodctr &gt; 0


Replace the whole case expression with this:

CASE WHEN si.rowmodctr &gt; 0 THEN CAST(si.rowmodctr / ( 1. * NULLIF(si.rowcnt, 0) ) * 100 AS DECIMAL(18, 1))
                                     ELSE si.rowmodctr
                                END AS percent_modifications,


The best place to file bug reports for Blitz* scripts is over here.

Thanks!