diff --git a/src/utils/services/projects.manager.ts b/src/utils/services/projects.manager.ts
index 4c2385d..66cc7c6 100644
--- a/src/utils/services/projects.manager.ts
+++ b/src/utils/services/projects.manager.ts
@@ -468,6 +468,7 @@ class ProjectsManager {
 
       const existing = await this.participantsDatabaseManager.find({
         tz: data.tz,
+        projectId: new ObjectId(data.projectId),
       });
       if (existing.length !== 0) {
         return {