diff --git a/pkg/webhook/v1beta1/experiment/validator/validator.go b/pkg/webhook/v1beta1/experiment/validator/validator.go
index 5b3553ee01a..aeaf911904a 100644
--- a/pkg/webhook/v1beta1/experiment/validator/validator.go
+++ b/pkg/webhook/v1beta1/experiment/validator/validator.go
@@ -74,22 +74,23 @@ func (g *DefaultValidator) ValidateExperiment(instance, oldInst *experimentsv1be
 		return fmt.Errorf(msg)
 	}
 
-	if instance.Spec.MaxFailedTrialCount != nil {
-		if *instance.Spec.MaxFailedTrialCount < 0 {
-			return fmt.Errorf("spec.maxFailedTrialCount should not be less than 0")
-		}
-		if instance.Spec.MaxTrialCount != nil && *instance.Spec.MaxFailedTrialCount > *instance.Spec.MaxTrialCount {
-			return fmt.Errorf("spec.maxFailedTrialCount should be less than or equal to spec.maxTrialCount")
-		}
+	if instance.Spec.MaxFailedTrialCount != nil && *instance.Spec.MaxFailedTrialCount < 0 {
+		return fmt.Errorf("spec.maxFailedTrialCount should not be less than 0")
 	}
 	if instance.Spec.MaxTrialCount != nil && *instance.Spec.MaxTrialCount <= 0 {
 		return fmt.Errorf("spec.maxTrialCount must be greater than 0")
 	}
-	if instance.Spec.ParallelTrialCount != nil {
-		if *instance.Spec.ParallelTrialCount <= 0 {
-			return fmt.Errorf("spec.parallelTrialCount must be greater than 0")
+	if instance.Spec.ParallelTrialCount != nil && *instance.Spec.ParallelTrialCount <= 0 {
+		return fmt.Errorf("spec.parallelTrialCount must be greater than 0")
+	}
+
+	if instance.Spec.MaxFailedTrialCount != nil && instance.Spec.MaxTrialCount != nil {
+		if *instance.Spec.MaxFailedTrialCount > *instance.Spec.MaxTrialCount {
+			return fmt.Errorf("spec.maxFailedTrialCount should be less than or equal to spec.maxTrialCount")
 		}
-		if instance.Spec.MaxTrialCount != nil && *instance.Spec.ParallelTrialCount > *instance.Spec.MaxTrialCount {
+	}
+	if instance.Spec.ParallelTrialCount != nil && instance.Spec.MaxTrialCount != nil {
+		if *instance.Spec.ParallelTrialCount > *instance.Spec.MaxTrialCount {
 			return fmt.Errorf("spec.paralelTrialCount should be less than or equal to spec.maxTrialCount")
 		}
 	}