diff --git a/server/accounting/qbxml/qbxml-receivables.js b/server/accounting/qbxml/qbxml-receivables.js
index 49f67f397..375a99d88 100644
--- a/server/accounting/qbxml/qbxml-receivables.js
+++ b/server/accounting/qbxml/qbxml-receivables.js
@@ -221,7 +221,7 @@ const generateInvoiceQbxml = (
             amount: Math.round((jobline.act_price || 0) * 100),
           })
             .multiply(jobline.part_qty || 0)
-            .percentage(jobline.prt_dsmk_p)
+            .percentage(jobline.prt_dsmk_p || 0)
         );
       const account = responsibilityCenters.profits.find(
         (i) => jobline.profitcenter_part.toLowerCase() === i.name.toLowerCase()