diff --git a/packages/plugins/plugin-cert/src/plugin/cert-plugin/acme.ts b/packages/plugins/plugin-cert/src/plugin/cert-plugin/acme.ts
index 53ef4b13..b941474f 100644
--- a/packages/plugins/plugin-cert/src/plugin/cert-plugin/acme.ts
+++ b/packages/plugins/plugin-cert/src/plugin/cert-plugin/acme.ts
@@ -226,7 +226,8 @@ export class AcmeService {
     /* Create CSR */
     const { commonName, altNames } = this.buildCommonNameByDomains(domains);
     let privateKey = null;
-    const privateKeyArr = options.privateKeyType.split("_");
+    const privateKeyType = options.privateKeyType || "rsa_2048";
+    const privateKeyArr = privateKeyType.split("_");
     const type = privateKeyArr[0];
     const size = parseInt(privateKeyArr[1]);
     if (type == "ec") {
diff --git a/packages/plugins/plugin-cert/src/plugin/cert-plugin/index.ts b/packages/plugins/plugin-cert/src/plugin/cert-plugin/index.ts
index 622b2d6f..d9b5d5e0 100644
--- a/packages/plugins/plugin-cert/src/plugin/cert-plugin/index.ts
+++ b/packages/plugins/plugin-cert/src/plugin/cert-plugin/index.ts
@@ -55,7 +55,7 @@ export class CertApplyPlugin extends CertApplyBasePlugin {
         { value: "rsa_4096", label: "RSA 4096" },
         { value: "ec_256", label: "EC 256" },
         { value: "ec_384", label: "EC 384" },
-        { value: "ec_521", label: "EC 521" },
+        // { value: "ec_521", label: "EC 521" },
       ],
     },
     required: true,