diff --git a/rattail/batch/custorder.py b/rattail/batch/custorder.py
index 4761756f5efe9e32d6ec637efa142d3731738340..7378c322c0fef98974f35a4fee9ccad3a59ce681 100644
--- a/rattail/batch/custorder.py
+++ b/rattail/batch/custorder.py
@@ -83,7 +83,7 @@ class CustomerOrderBatchHandler(BatchHandler):
         else:
             row.total_price = row.unit_price * row.order_quantity
             if row.order_uom == self.enum.UNIT_OF_MEASURE_CASE:
-                row.total_price *= row.case_quantity
+                row.total_price *= (row.case_quantity or 1)
 
         # update total price for batch too, if it changed
         if row.total_price != old_total: