diff --git a/erpnext/public/js/controllers/taxes_and_totals.js b/erpnext/public/js/controllers/taxes_and_totals.js
index 06298ca..2149f6d 100644
--- a/erpnext/public/js/controllers/taxes_and_totals.js
+++ b/erpnext/public/js/controllers/taxes_and_totals.js
@@ -588,7 +588,7 @@
 		payment_status = true;
 		if(this.frm.doc.is_pos && (update_paid_amount===undefined || update_paid_amount)){
 			$.each(this.frm.doc['payments'] || [], function(index, data){
-				if(data.type == "Cash" && payment_status) {
+				if(data.type == "Cash" && payment_status && total_amount_to_pay > 0) {
 					data.base_amount = flt(total_amount_to_pay, precision("base_amount"));
 					data.amount = flt(total_amount_to_pay / me.frm.doc.conversion_rate, precision("amount"));
 					payment_status = false;
diff --git a/erpnext/public/js/payment/payments.js b/erpnext/public/js/payment/payments.js
index c5d0749..438ad79 100644
--- a/erpnext/public/js/payment/payments.js
+++ b/erpnext/public/js/payment/payments.js
@@ -199,7 +199,7 @@
 			if(me.idx == 'change_amount'){
 				me.change_amount(value)
 			} else{
-				if(flt(value) == 0 && update_write_off) {
+				if(flt(value) == 0 && update_write_off && me.frm.doc.outstanding_amount > 0) {
 					value = flt(me.frm.doc.outstanding_amount / me.frm.doc.conversion_rate, precision(me.idx));
 				}
 				me.write_off_amount(value)