diff --git a/erpnext/stock/doctype/quality_inspection/quality_inspection.py b/erpnext/stock/doctype/quality_inspection/quality_inspection.py
index 536a88fb868d..60f048673fb8 100644
--- a/erpnext/stock/doctype/quality_inspection/quality_inspection.py
+++ b/erpnext/stock/doctype/quality_inspection/quality_inspection.py
@@ -242,6 +242,9 @@ def get_formula_evaluation_data(self, reading):
 			# numeric readings
 			for i in range(1, 11):
 				field = "reading_" + str(i)
+				if reading.get(field) is None:
+					continue
+
 				data[field] = parse_float(reading.get(field))
 			data["mean"] = self.calculate_mean(reading)