diff --git a/ci/jenkins/test.sh b/ci/jenkins/test.sh
index 67dea80733d..a4c14473352 100755
--- a/ci/jenkins/test.sh
+++ b/ci/jenkins/test.sh
@@ -35,7 +35,7 @@ IMAGE_PULL_POLICY="Always"
 PROXY_ALL=false
 DEFAULT_IP_MODE="ipv4"
 IP_MODE=""
-K8S_VERSION="1.28.2-00"
+K8S_VERSION="1.28.9-2.1"
 WINDOWS_YAML_SUFFIX="windows"
 WIN_IMAGE_NODE=""
 echo "" > WIN_DHCP
@@ -169,15 +169,15 @@ function export_govc_env_var {
 
 function clean_antrea {
     echo "====== Cleanup Antrea Installation ======"
-    clean_ns "monitoring"
-    clean_ns "antrea-ipam-test"
-    clean_ns "antrea-test"
+    clean_ns "monitoring" || true
+    clean_ns "antrea-ipam-test" || true
+    clean_ns "antrea-test" || true
     echo "====== Cleanup Conformance Namespaces ======"
-    clean_ns "net"
-    clean_ns "service"
-    clean_ns "x-"
-    clean_ns "y-"
-    clean_ns "z-"
+    clean_ns "net" || true
+    clean_ns "service" || true
+    clean_ns "x-" || true
+    clean_ns "y-" || true
+    clean_ns "z-" || true
 
     # Delete antrea-prometheus first for k8s>=1.22 to avoid Pod stuck in Terminating state.
     kubectl delete -f ${WORKDIR}/antrea-prometheus.yml --ignore-not-found=true || true
@@ -853,24 +853,26 @@ function redeploy_k8s_if_ip_mode_changes() {
     HAS_IPV6=${INITIAL_VALUE}
     POD_CIDRS=($( (kubectl get node ${CONTROL_PLANE_HOSTNAME} -o json | jq -r '.spec.podCIDRs | @sh') | tr -d \'\")) || true
     echo "POD_CIDRS=${POD_CIDRS[*]}"
-    for POD_CIDR in "${POD_CIDRS[@]}"; do
-        if [[ $POD_CIDR =~ .*:.* ]]
-        then
-            (( HAS_IPV6++ ))
+    if [[ -n $POD_CIDRS ]]; then
+        for POD_CIDR in "${POD_CIDRS[@]}"; do
+            if [[ $POD_CIDR =~ .*:.* ]]
+            then
+                (( HAS_IPV6++ ))
+            else
+                (( HAS_IPV4++ ))
+            fi
+        done
+        if [[ ${IP_MODE} == "ipv4" ]]; then
+            (( HAS_IPV4-- ))
+        elif [[ ${IP_MODE} == "ipv6" ]]; then
+            (( HAS_IPV6-- ))
         else
-            (( HAS_IPV4++ ))
+            (( HAS_IPV4-- ))
+            (( HAS_IPV6-- ))
+        fi
+        if [ ${HAS_IPV4} -eq ${INITIAL_VALUE} ] && [ ${HAS_IPV6} -eq ${INITIAL_VALUE} ]; then
+          return 0
         fi
-    done
-    if [[ ${IP_MODE} == "ipv4" ]]; then
-        (( HAS_IPV4-- ))
-    elif [[ ${IP_MODE} == "ipv6" ]]; then
-        (( HAS_IPV6-- ))
-    else
-        (( HAS_IPV4-- ))
-        (( HAS_IPV6-- ))
-    fi
-    if [ ${HAS_IPV4} -eq ${INITIAL_VALUE} ] && [ ${HAS_IPV6} -eq ${INITIAL_VALUE} ]; then
-      return 0
     fi
 
     echo "===== Reset K8s cluster Nodes ====="