From df21ce8043c03cf6131556abeeceae72534d48c4 Mon Sep 17 00:00:00 2001
From: Igor Kulikov <ikulikov@thingsboard.io>
Date: Wed, 11 Nov 2020 19:02:01 +0200
Subject: [PATCH] Fix validate credentials method

---
 .../server/service/transport/DefaultTransportApiService.java    | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/application/src/main/java/org/thingsboard/server/service/transport/DefaultTransportApiService.java b/application/src/main/java/org/thingsboard/server/service/transport/DefaultTransportApiService.java
index c7cbea8200..5ceb9b3cd6 100644
--- a/application/src/main/java/org/thingsboard/server/service/transport/DefaultTransportApiService.java
+++ b/application/src/main/java/org/thingsboard/server/service/transport/DefaultTransportApiService.java
@@ -165,7 +165,7 @@ public class DefaultTransportApiService implements TransportApiService {
 
     private ListenableFuture<TransportApiResponseMsg> validateCredentials(TransportProtos.ValidateBasicMqttCredRequestMsg mqtt) {
         DeviceCredentials credentials = null;
-        if (mqtt.getUserName() != null) {
+        if (!StringUtils.isEmpty(mqtt.getUserName())) {
             credentials = deviceCredentialsService.findDeviceCredentialsByCredentialsId(mqtt.getUserName());
             if (credentials != null) {
                 if (credentials.getCredentialsType() == DeviceCredentialsType.ACCESS_TOKEN) {