diff --git a/packages/certd/src/dns-provider/dns-provider-factory.js b/packages/certd/src/dns-provider/dns-provider-factory.js
index bb04a1d0..2669a585 100644
--- a/packages/certd/src/dns-provider/dns-provider-factory.js
+++ b/packages/certd/src/dns-provider/dns-provider-factory.js
@@ -1,7 +1,11 @@
 export class DnsProviderFactory {
   static async createByType (type, options) {
-    const ProviderModule = await import('./impl/' + type + '.js')
-    const Provider = ProviderModule.default
-    return new Provider(options)
+    try {
+      const ProviderModule = await import('./impl/' + type + '.js')
+      const Provider = ProviderModule.default
+      return new Provider(options)
+    } catch (e) {
+      throw new Error('暂不支持此dnsProvider：' + type, e)
+    }
   }
 }
diff --git a/packages/certd/src/index.js b/packages/certd/src/index.js
index 1dc43f30..358284ac 100644
--- a/packages/certd/src/index.js
+++ b/packages/certd/src/index.js
@@ -92,6 +92,7 @@ export class Certd {
     await this.writeCert(cert)
     const certRet = await this.readCurrentCert()
     certRet.isNew = true
+    return certRet
   }
 
   async createDnsProvider (options) {
@@ -110,6 +111,9 @@ export class Certd {
 
   async readCurrentCert () {
     const cert = await this.certStore.readCert()
+    if (cert == null) {
+      return null
+    }
     const { detail, expires } = this.getCrtDetail(cert.crt)
     const domain = this.getMainDomain(this.options.cert.domains)
     return {
diff --git a/packages/certd/src/store/cert-store.js b/packages/certd/src/store/cert-store.js
index d4ab76d9..14956f4a 100644
--- a/packages/certd/src/store/cert-store.js
+++ b/packages/certd/src/store/cert-store.js
@@ -39,9 +39,9 @@ export class CertStore {
     const crtKey = this.buildKey(newDir, this.safetyDomain + '.crt')
     const priKey = this.buildKey(newDir, this.safetyDomain + '.key')
     const csrKey = this.buildKey(newDir, this.safetyDomain + '.csr')
-    await this.store.set(crtKey, this.formatCert(cert.crt))
-    await this.store.set(priKey, this.formatCert(cert.key))
-    await this.store.set(csrKey, cert.csr)
+    await this.store.set(crtKey, this.formatCert(cert.crt.toString()))
+    await this.store.set(priKey, this.formatCert(cert.key.toString()))
+    await this.store.set(csrKey, cert.csr.toString())
 
     await this.store.link(newDir, this.currentRootPath)
 
@@ -56,6 +56,9 @@ export class CertStore {
     const priKey = this.buildKey(dir, this.safetyDomain + '.key')
     const csrKey = this.buildKey(dir, this.safetyDomain + '.csr')
     const crt = await this.store.get(crtKey)
+    if (crt == null) {
+      return null
+    }
     const key = await this.store.get(priKey)
     const csr = await this.store.get(csrKey)
 
diff --git a/packages/node-acme-client b/packages/node-acme-client
index 1799074c..e384bc3c 160000
--- a/packages/node-acme-client
+++ b/packages/node-acme-client
@@ -1 +1 @@
-Subproject commit 1799074c0d63c75b98e98486bc979e099b1ad4f3
+Subproject commit e384bc3c8e6ba95fc8dcab301c3cfaba8bb450f5