diff --git a/back/models/vn-user.js b/back/models/vn-user.js
index 62bdfa2da..5845c2192 100644
--- a/back/models/vn-user.js
+++ b/back/models/vn-user.js
@@ -131,7 +131,7 @@ module.exports = function(Self) {
 
         const userToken = await token.user.get();
 
-        if (userToken.username !== user) {
+        if (userToken.username.toLowerCase() !== user.toLowerCase()) {
             console.error('ERROR!!! - Signin with other user', userToken, user);
             throw new UserError('Try again');
         }
diff --git a/loopback/locale/en.json b/loopback/locale/en.json
index 26650175d..9f9961f57 100644
--- a/loopback/locale/en.json
+++ b/loopback/locale/en.json
@@ -196,6 +196,6 @@
 	"Negative basis of tickets: 23": "Negative basis of tickets: 23",
 	"Booking completed": "Booking complete",
 	"The ticket is in preparation": "The ticket [{{ticketId}}]({{{ticketUrl}}}) of the sales person {{salesPersonId}} is in preparation",
-	"You can only add negative amounts in refund tickets": "You can only add negative amounts in refund tickets"
-}
-
+	"You can only add negative amounts in refund tickets": "You can only add negative amounts in refund tickets",
+	"Try again": "Try again"
+}
\ No newline at end of file