diff --git a/src/CenterMentor/centermentor.schema.ts b/src/CenterMentor/centermentor.schema.ts
index e943b66..8601335 100644
--- a/src/CenterMentor/centermentor.schema.ts
+++ b/src/CenterMentor/centermentor.schema.ts
@@ -147,9 +147,16 @@ export class CenterMentorSchema extends PothosSchema {
             if (!userId) {
               throw new Error('User ID is required')
             }
-            // block invite center owner
-            const centerOwner = await prisma.center.findUnique({
-              where: { centerOwnerId: userId },
+            // get user info
+            const user = await prisma.user.findUnique({
+              where: { email: args.email },
+            })
+            if (!user) {
+              throw new Error('User not found')
+            }
+            // block invite center owner from another center
+            const centerOwner = await prisma.center.findFirst({
+              where: { centerOwnerId: user.id },
             })
             if (centerOwner) {
               throw new Error('Center owner cannot be invited as a mentor')