From 05174bb816950f6f77ffb68fc62f81380fe2ac05 Mon Sep 17 00:00:00 2001
From: Andrii Shvaika <ashvayka@thingsboard.io>
Date: Tue, 23 Jun 2020 15:24:16 +0300
Subject: [PATCH] Fixed case with empty query

---
 .../service/telemetry/DefaultTelemetryWebSocketService.java     | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/application/src/main/java/org/thingsboard/server/service/telemetry/DefaultTelemetryWebSocketService.java b/application/src/main/java/org/thingsboard/server/service/telemetry/DefaultTelemetryWebSocketService.java
index b9f4ab022b..678a191384 100644
--- a/application/src/main/java/org/thingsboard/server/service/telemetry/DefaultTelemetryWebSocketService.java
+++ b/application/src/main/java/org/thingsboard/server/service/telemetry/DefaultTelemetryWebSocketService.java
@@ -652,7 +652,7 @@ public class DefaultTelemetryWebSocketService implements TelemetryWebSocketServi
                     "Cmd id is negative value!");
             sendWsMsg(sessionRef, update);
             return false;
-        } else if (cmd.getQuery() == null) {
+        } else if (cmd.getQuery() == null && cmd.getLatestCmd() == null && cmd.getHistoryCmd() == null && cmd.getTsCmd() == null) {
             SubscriptionUpdate update = new SubscriptionUpdate(cmd.getCmdId(), SubscriptionErrorCode.BAD_REQUEST,
                     "Query is empty!");
             sendWsMsg(sessionRef, update);