diff --git a/internal/store/cloneset.go b/internal/store/cloneset.go
index dfe692c..08204e4 100644
--- a/internal/store/cloneset.go
+++ b/internal/store/cloneset.go
@@ -173,7 +173,11 @@ func cloneSetMetricFamilies(allowAnnotationsList, allowLabelsList []string) []ge
 			metric.Gauge,
 			"",
 			wrapCloneSetFunc(func(cs *v1alpha1.CloneSet) *metric.Family {
-				maxUnavailable, err := intstr.GetValueFromIntOrPercent(cs.Spec.UpdateStrategy.MaxUnavailable, int(*cs.Spec.Replicas), false)
+				updateStrategyMaxUnavailable := intstr.FromInt(0)
+				if cs.Spec.UpdateStrategy.MaxUnavailable == nil {
+					updateStrategyMaxUnavailable = *cs.Spec.UpdateStrategy.MaxUnavailable
+				}
+				maxUnavailable, err := intstr.GetValueFromIntOrPercent(&updateStrategyMaxUnavailable, int(*cs.Spec.Replicas), false)
 				if err != nil {
 					panic(err)
 				}
@@ -193,7 +197,11 @@ func cloneSetMetricFamilies(allowAnnotationsList, allowLabelsList []string) []ge
 			metric.Gauge,
 			"",
 			wrapCloneSetFunc(func(cs *v1alpha1.CloneSet) *metric.Family {
-				maxSurge, err := intstr.GetValueFromIntOrPercent(cs.Spec.UpdateStrategy.MaxSurge, int(*cs.Spec.Replicas), true)
+				updateStrategyMaxSurge := intstr.FromInt(0)
+				if cs.Spec.UpdateStrategy.MaxSurge != nil {
+					updateStrategyMaxSurge = *cs.Spec.UpdateStrategy.MaxSurge
+				}
+				maxSurge, err := intstr.GetValueFromIntOrPercent(&updateStrategyMaxSurge, int(*cs.Spec.Replicas), true)
 				if err != nil {
 					panic(err)
 				}
diff --git a/internal/store/daemonset.go b/internal/store/daemonset.go
index e48208b..673725d 100644
--- a/internal/store/daemonset.go
+++ b/internal/store/daemonset.go
@@ -93,7 +93,11 @@ func daemonSetMetricFamilies(allowAnnotationsList, allowLabelsList []string) []g
 			metric.Gauge,
 			"",
 			wrapDaemonSetFunc(func(ds *v1alpha1.DaemonSet) *metric.Family {
-				maxSurge, err := intstr.GetValueFromIntOrPercent(ds.Spec.UpdateStrategy.RollingUpdate.MaxSurge, int(ds.Status.DesiredNumberScheduled), true)
+				rollingUpdateMaxSurge := intstr.FromInt(0)
+				if ds.Spec.UpdateStrategy.RollingUpdate.MaxSurge != nil {
+					rollingUpdateMaxSurge = *ds.Spec.UpdateStrategy.RollingUpdate.MaxSurge
+				}
+				maxSurge, err := intstr.GetValueFromIntOrPercent(&rollingUpdateMaxSurge, int(ds.Status.DesiredNumberScheduled), true)
 				if err != nil {
 					panic(err)
 				}
diff --git a/internal/store/sidecarset.go b/internal/store/sidecarset.go
index 7d8a58d..f101394 100644
--- a/internal/store/sidecarset.go
+++ b/internal/store/sidecarset.go
@@ -92,7 +92,7 @@ func sidecarSetMetricFamilies(allowAnnotationsList, allowLabelsList []string) []
 			}),
 		),
 		*generator.NewFamilyGenerator(
-			"kruise_sidecarset_status_replicas_ready ",
+			"kruise_sidecarset_status_replicas_ready",
 			"The number of ready  replicas per sidecarset.",
 			metric.Gauge,
 			"",