From 351f44abd36eeb6ff4fc86179213231003d3bb93 Mon Sep 17 00:00:00 2001
From: patrickmann <patrick.mann@graylog.com>
Date: Thu, 4 Jul 2024 12:50:36 +0200
Subject: [PATCH] quick fix TelemetryResponse for drawdown license

---
 .../graylog2/telemetry/rest/TelemetryResponseFactory.java   | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/graylog2-server/src/main/java/org/graylog2/telemetry/rest/TelemetryResponseFactory.java b/graylog2-server/src/main/java/org/graylog2/telemetry/rest/TelemetryResponseFactory.java
index c6ab97426ff4..0047696df91e 100644
--- a/graylog2-server/src/main/java/org/graylog2/telemetry/rest/TelemetryResponseFactory.java
+++ b/graylog2-server/src/main/java/org/graylog2/telemetry/rest/TelemetryResponseFactory.java
@@ -16,6 +16,7 @@
  */
 package org.graylog2.telemetry.rest;
 
+import com.google.common.base.Strings;
 import org.graylog2.system.stats.elasticsearch.NodeInfo;
 import org.graylog2.telemetry.enterprise.TelemetryLicenseStatus;
 import org.joda.time.DateTime;
@@ -160,6 +161,9 @@ private List<TelemetryLicenseStatus> filter(List<TelemetryLicenseStatus> telemet
     }
 
     private String formatLicenseString(TelemetryLicenseStatus telemetryLicenseStatus) {
-        return telemetryLicenseStatus.subject().replace("/", "_").substring(1);
+        if (!Strings.isNullOrEmpty(telemetryLicenseStatus.subject())) {
+            return telemetryLicenseStatus.subject().replace("/", "_").substring(1);
+        }
+        return "";
     }
 }