diff --git a/kernel/av/value.go b/kernel/av/value.go
index 6e80d1ec0..3901084d4 100644
--- a/kernel/av/value.go
+++ b/kernel/av/value.go
@@ -716,7 +716,7 @@ func (r *ValueRollup) RenderContents(calc *RollupCalc, destKey *Key) {
 	case CalcOperatorSum:
 		sum := 0.0
 		for _, v := range r.Contents {
-			if nil != v.Number {
+			if KeyTypeNumber == v.Type && nil != v.Number && v.Number.IsNotEmpty {
 				sum += v.Number.Content
 			}
 		}
@@ -725,7 +725,7 @@ func (r *ValueRollup) RenderContents(calc *RollupCalc, destKey *Key) {
 		sum := 0.0
 		count := 0
 		for _, v := range r.Contents {
-			if nil != v.Number {
+			if KeyTypeNumber == v.Type && nil != v.Number && v.Number.IsNotEmpty {
 				sum += v.Number.Content
 				count++
 			}
@@ -736,7 +736,7 @@ func (r *ValueRollup) RenderContents(calc *RollupCalc, destKey *Key) {
 	case CalcOperatorMedian:
 		var numbers []float64
 		for _, v := range r.Contents {
-			if nil != v.Number {
+			if KeyTypeNumber == v.Type && nil != v.Number && v.Number.IsNotEmpty {
 				numbers = append(numbers, v.Number.Content)
 			}
 		}
@@ -747,7 +747,7 @@ func (r *ValueRollup) RenderContents(calc *RollupCalc, destKey *Key) {
 	case CalcOperatorMin:
 		minVal := math.MaxFloat64
 		for _, v := range r.Contents {
-			if nil != v.Number {
+			if KeyTypeNumber == v.Type && nil != v.Number && v.Number.IsNotEmpty {
 				if v.Number.Content < minVal {
 					minVal = v.Number.Content
 				}
@@ -757,7 +757,7 @@ func (r *ValueRollup) RenderContents(calc *RollupCalc, destKey *Key) {
 	case CalcOperatorMax:
 		maxVal := -math.MaxFloat64
 		for _, v := range r.Contents {
-			if nil != v.Number {
+			if KeyTypeNumber == v.Type && nil != v.Number && v.Number.IsNotEmpty {
 				if v.Number.Content > maxVal {
 					maxVal = v.Number.Content
 				}
@@ -768,7 +768,7 @@ func (r *ValueRollup) RenderContents(calc *RollupCalc, destKey *Key) {
 		minVal := math.MaxFloat64
 		maxVal := -math.MaxFloat64
 		for _, v := range r.Contents {
-			if nil != v.Number {
+			if KeyTypeNumber == v.Type && nil != v.Number && v.Number.IsNotEmpty {
 				if v.Number.Content < minVal {
 					minVal = v.Number.Content
 				}