diff --git a/procs/single_price_call.pg.sql b/procs/single_price_call.pg.sql
index 3ec1fef..0161be2 100644
--- a/procs/single_price_call.pg.sql
+++ b/procs/single_price_call.pg.sql
@@ -289,7 +289,7 @@ BEGIN
       AND tp.ds = _last_dataseg
       AND tp.chan = _chan
       AND tp.tier = _tier
-      AND FLOOR(_last_qty / _pltq)::int <@ tp.vol;
+      AND FLOOR(_last_qty / NULLIF(_pltq, 0))::int <@ tp.vol;
 
     ------------------------------------------------------------------
     -- Step 4: Cost data for normalization