diff --git a/pkg/apiserver/domain/service/util.go b/pkg/apiserver/domain/service/util.go
index 2292de749..5a4b9a2d5 100644
--- a/pkg/apiserver/domain/service/util.go
+++ b/pkg/apiserver/domain/service/util.go
@@ -52,6 +52,9 @@ func guaranteePolicyNotExist(c []string, policy string) ([]string, bool) {
 // extractPolicyListAndProperty can extract policy from  string-format properties, and return
 // map-format properties in order to further update operation.
 func extractPolicyListAndProperty(property string) ([]string, map[string]interface{}, error) {
+	if len(property) == 0 {
+		return nil, nil, nil
+	}
 	content := map[string]interface{}{}
 	err := json.Unmarshal([]byte(property), &content)
 	if err != nil {
diff --git a/pkg/apiserver/domain/service/util_test.go b/pkg/apiserver/domain/service/util_test.go
index 5b922fc01..22bba2ee8 100644
--- a/pkg/apiserver/domain/service/util_test.go
+++ b/pkg/apiserver/domain/service/util_test.go
@@ -208,6 +208,14 @@ func TestExtractPolicyListAndProperty(t *testing.T) {
 				noError    bool
 			}{noError: false},
 		},
+		{
+			input: ``,
+			res: struct {
+				policies   []string
+				properties map[string]interface{}
+				noError    bool
+			}{policies: nil, properties: nil, noError: true},
+		},
 	}
 	for _, testCase := range testCases {
 		policy, properties, err := extractPolicyListAndProperty(testCase.input)