diff --git a/pkg/controllers/cluster/cluster_controller.go b/pkg/controllers/cluster/cluster_controller.go
index e06eb9a84..d2c124d77 100644
--- a/pkg/controllers/cluster/cluster_controller.go
+++ b/pkg/controllers/cluster/cluster_controller.go
@@ -606,27 +606,31 @@ func (c *Controller) processTaintBaseEviction(ctx context.Context, cluster *clus
 
 func (c *Controller) taintClusterByCondition(ctx context.Context, cluster *clusterv1alpha1.Cluster) error {
 	currentReadyCondition := meta.FindStatusCondition(cluster.Status.Conditions, clusterv1alpha1.ClusterConditionReady)
-
+	var err error
 	if currentReadyCondition != nil {
 		switch currentReadyCondition.Status {
 		case metav1.ConditionFalse:
 			// Add NotReadyTaintTemplateForSched taint immediately.
-			if err := utilhelper.UpdateClusterControllerTaint(ctx, c.Client, []*corev1.Taint{NotReadyTaintTemplateForSched}, []*corev1.Taint{UnreachableTaintTemplateForSched}, cluster); err != nil {
+			if err = utilhelper.UpdateClusterControllerTaint(ctx, c.Client, []*corev1.Taint{NotReadyTaintTemplateForSched}, []*corev1.Taint{UnreachableTaintTemplateForSched}, cluster); err != nil {
 				klog.ErrorS(err, "Failed to instantly update UnreachableTaintForSched to NotReadyTaintForSched, will try again in the next cycle.", "cluster", cluster.Name)
 			}
 		case metav1.ConditionUnknown:
 			// Add UnreachableTaintTemplateForSched taint immediately.
-			if err := utilhelper.UpdateClusterControllerTaint(ctx, c.Client, []*corev1.Taint{UnreachableTaintTemplateForSched}, []*corev1.Taint{NotReadyTaintTemplateForSched}, cluster); err != nil {
+			if err = utilhelper.UpdateClusterControllerTaint(ctx, c.Client, []*corev1.Taint{UnreachableTaintTemplateForSched}, []*corev1.Taint{NotReadyTaintTemplateForSched}, cluster); err != nil {
 				klog.ErrorS(err, "Failed to instantly swap NotReadyTaintForSched to UnreachableTaintForSched, will try again in the next cycle.", "cluster", cluster.Name)
 			}
 		case metav1.ConditionTrue:
-			if err := utilhelper.UpdateClusterControllerTaint(ctx, c.Client, nil, []*corev1.Taint{NotReadyTaintTemplateForSched, UnreachableTaintTemplateForSched}, cluster); err != nil {
+			if err = utilhelper.UpdateClusterControllerTaint(ctx, c.Client, nil, []*corev1.Taint{NotReadyTaintTemplateForSched, UnreachableTaintTemplateForSched}, cluster); err != nil {
 				klog.ErrorS(err, "Failed to remove schedule taints from cluster, will retry in next iteration.", "cluster", cluster.Name)
 			}
 		}
+	} else {
+		// Add NotReadyTaintTemplateForSched taint immediately.
+		if err = utilhelper.UpdateClusterControllerTaint(ctx, c.Client, []*corev1.Taint{NotReadyTaintTemplateForSched}, nil, cluster); err != nil {
+			klog.ErrorS(err, "Failed to add a NotReady taint to the newly added cluster, will try again in the next cycle.", "cluster", cluster.Name)
+		}
 	}
-
-	return nil
+	return err
 }
 
 func (c *Controller) collectIDForClusterObjectIfNeeded(ctx context.Context) (err error) {