diff --git a/src/models/projectMemberInvite.js b/src/models/projectMemberInvite.js
index ae27d0cb..3b1e51cb 100644
--- a/src/models/projectMemberInvite.js
+++ b/src/models/projectMemberInvite.js
@@ -68,7 +68,10 @@ module.exports = function defineProjectMemberInvite(sequelize, DataTypes) {
         const where = { projectId, status: INVITE_STATUS.PENDING };
 
         if (email && userId) {
-          _.assign(where, { $or: [{ email: { $eq: email } }, { userId: { $eq: userId } }] });
+          _.assign(where, { $or: [
+            { email: { $eq: email.toLowerCase() } },
+            { userId: { $eq: userId } },
+          ] });
         } else if (email) {
           _.assign(where, { email });
         } else if (userId) {
diff --git a/src/routes/projectMemberInvites/create.js b/src/routes/projectMemberInvites/create.js
index 46b70399..f1c1edd7 100644
--- a/src/routes/projectMemberInvites/create.js
+++ b/src/routes/projectMemberInvites/create.js
@@ -267,7 +267,7 @@ module.exports = [
                 req.app.emit(EVENT.ROUTING_KEY.PROJECT_MEMBER_INVITE_CREATED, {
                   req,
                   userId: v.userId,
-                  email: v.email,
+                  email: v.email ? v.email.toLowerCase() : v.email,
                   status: v.status,
                   role: v.role,
                 });