diff --git a/src/server/auth.ts b/src/server/auth.ts
index fb0d6f3..19fb0d4 100644
--- a/src/server/auth.ts
+++ b/src/server/auth.ts
@@ -37,7 +37,7 @@ declare module "next-auth" {
  *
  * @see https://stackoverflow.com/a/75526977
  */
-declare module 'next-auth/jwt' {
+declare module "next-auth/jwt" {
   interface JWT {
     id_token?: string;
     provider?: string;
@@ -56,9 +56,14 @@ const originLinkAccount = adapter.linkAccount;
  */
 adapter.linkAccount = (account: AdapterAccount) => {
   // eslint-disable-next-line @typescript-eslint/no-unused-vars
-  const { 'not-before-policy': _, refresh_expires_in, ...data } = account;
+  const { "not-before-policy": _, refresh_expires_in, ...data } = account;
+
+  if (!originLinkAccount) {
+    return;
+  }
+
   return originLinkAccount(data);
-}
+};
 
 /**
  * Options for NextAuth.js used to configure adapters, providers, callbacks, etc.
@@ -83,10 +88,10 @@ export const authOptions: NextAuthOptions = {
      */
     jwt({ token, account }) {
       if (account) {
-        token.id_token = account?.id_token
-        token.provider = account?.provider
+        token.id_token = account?.id_token;
+        token.provider = account?.provider;
       }
-      return token
+      return token;
     },
   },
   adapter: adapter,
@@ -119,12 +124,14 @@ export const authOptions: NextAuthOptions = {
      */
     async signOut({ token }: { token: JWT }) {
       if (token.provider === "keycloak") {
-        const logOutURL = new URL(`${env.KEYCLOAK_ISSUER}/protocol/openid-connect/logout`)
-        logOutURL.searchParams.set("id_token_hint", token.id_token ?? '')
+        const logOutURL = new URL(
+          `${env.KEYCLOAK_ISSUER}/protocol/openid-connect/logout`
+        );
+        logOutURL.searchParams.set("id_token_hint", token.id_token ?? "");
         await fetch(logOutURL);
       }
     },
-  }
+  },
 };
 
 /**