diff --git a/erpnext/manufacturing/doctype/bom/bom.py b/erpnext/manufacturing/doctype/bom/bom.py
index 58fce82c208..2ee62b06ad5 100644
--- a/erpnext/manufacturing/doctype/bom/bom.py
+++ b/erpnext/manufacturing/doctype/bom/bom.py
@@ -944,12 +944,14 @@ class BOM(WebsiteGenerator):
 					hour_rate / flt(self.conversion_rate) if self.conversion_rate and hour_rate else hour_rate
 				)
 
-		if row.hour_rate and row.time_in_mins:
+		if row.hour_rate:
 			row.base_hour_rate = flt(row.hour_rate) * flt(self.conversion_rate)
-			row.operating_cost = flt(row.hour_rate) * flt(row.time_in_mins) / 60.0
-			row.base_operating_cost = flt(row.operating_cost) * flt(self.conversion_rate)
-			row.cost_per_unit = row.operating_cost / (row.batch_size or 1.0)
-			row.base_cost_per_unit = row.base_operating_cost / (row.batch_size or 1.0)
+
+			if row.time_in_mins:
+				row.operating_cost = flt(row.hour_rate) * flt(row.time_in_mins) / 60.0
+				row.base_operating_cost = flt(row.operating_cost) * flt(self.conversion_rate)
+				row.cost_per_unit = row.operating_cost / (row.batch_size or 1.0)
+				row.base_cost_per_unit = row.base_operating_cost / (row.batch_size or 1.0)
 
 		if update_hour_rate:
 			row.db_update()