diff --git a/Server/controllers/authController.js b/Server/controllers/authController.js
index 184158e55..979a0b87e 100644
--- a/Server/controllers/authController.js
+++ b/Server/controllers/authController.js
@@ -60,6 +60,21 @@ const registerController = async (req, res, next) => {
     return;
   }
 
+  // Check if an admin user exists, if so, error
+  try {
+    const admin = await req.db.checkAdmin(req, res);
+    console.log(admin);
+    if (admin === true) {
+      throw new Error(errorMessages.AUTH_ADMIN_EXISTS);
+    }
+  } catch (error) {
+    console.log("WEEEEEEE", error.message);
+    error.service = SERVICE_NAME;
+    error.status = 403;
+    next(error);
+    return;
+  }
+
   // Create a new user
   try {
     const newUser = await req.db.insertUser(req, res);
diff --git a/Server/utils/messages.js b/Server/utils/messages.js
index aded84d59..787adc8f6 100644
--- a/Server/utils/messages.js
+++ b/Server/utils/messages.js
@@ -4,6 +4,7 @@ const errorMessages = {
   UNKNOWN_ERROR: "An unknown error occurred",
   // Auth Controller
   UNAUTHORIZED: "Unauthorized access",
+  AUTH_ADMIN_EXISTS: "Admin already exists",
 
   //Error handling middleware
   UNKNOWN_SERVICE: "Unknown service",