bug fixed

pages/api/v1/auth/[...nextauth].ts

@@ -1200,6 +1200,28 @@ export default async function auth(req: NextApiRequest, res: NextApiResponse) {
         if (trigger === "signIn" || trigger === "signUp")
           token.id = user?.id as number;
 
+        if (trigger === "signUp") {
+          const checkIfUserExists = await prisma.user.findUnique({
+            where: {
+              id: token.id,
+            },
+          });
+
+          if (checkIfUserExists && !checkIfUserExists.username) {
+            const autoGeneratedUsername =
+              "user" + Math.round(Math.random() * 1000000000);
+
+            await prisma.user.update({
+              where: {
+                id: token.id,
+              },
+              data: {
+                username: autoGeneratedUsername,
+              },
+            });
+          }
+        }
+
         return token;
       },
       async session({ session, token }) {