diff --git a/src/Service/service.schema.ts b/src/Service/service.schema.ts
index d91242b..3558ceb 100644
--- a/src/Service/service.schema.ts
+++ b/src/Service/service.schema.ts
@@ -420,8 +420,10 @@ export class ServiceSchema extends PothosSchema {
               })
               // get user ids from centerMentorIds
               const userIds = [center.centerOwnerId, ...mentorIds]
+              // remove duplicate user ids
+              const uniqueUserIds = [...new Set(userIds)]
               // send notification to user using context
-              userIds.forEach(async (id) => {
+              uniqueUserIds.forEach(async (id) => {
                 // add message to database
                 const message = await this.prisma.message.create({
                   data: {
@@ -447,7 +449,9 @@ export class ServiceSchema extends PothosSchema {
               // send notification to user using context
               // get user ids from mentorIds
               const userIds = [center.centerOwnerId, ...mentorIds]
-              userIds.forEach(async (id) => {
+              // remove duplicate user ids
+              const uniqueUserIds = [...new Set(userIds)]
+              uniqueUserIds.forEach(async (id) => {
                 // add message to database
                 const message = await this.prisma.message.create({
                   data: {