diff --git a/erpnext/stock/doctype/quality_inspection/quality_inspection.py b/erpnext/stock/doctype/quality_inspection/quality_inspection.py
index d7d60e56af6c24dbd3edc039163cb3cdf4513660..1f50d217d97a0021b42f27e2ca2ecc1ea0136eac 100644
--- a/erpnext/stock/doctype/quality_inspection/quality_inspection.py
+++ b/erpnext/stock/doctype/quality_inspection/quality_inspection.py
@@ -201,6 +201,9 @@ class QualityInspection(Document):
 			# 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)