From 1e01832b0c522eea1f0e9ff0dfdec222cff6d598 Mon Sep 17 00:00:00 2001
From: Hendrik Muhs <hendrik.muhs@elastic.co>
Date: Mon, 3 Aug 2020 16:40:11 +0200
Subject: [PATCH] fix possible NPE introduced in #60591

---
 .../transforms/pivot/CompositeBucketsChangeCollector.java       | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/x-pack/plugin/transform/src/main/java/org/elasticsearch/xpack/transform/transforms/pivot/CompositeBucketsChangeCollector.java b/x-pack/plugin/transform/src/main/java/org/elasticsearch/xpack/transform/transforms/pivot/CompositeBucketsChangeCollector.java
index ade63afa51a..1aea4f0d457 100644
--- a/x-pack/plugin/transform/src/main/java/org/elasticsearch/xpack/transform/transforms/pivot/CompositeBucketsChangeCollector.java
+++ b/x-pack/plugin/transform/src/main/java/org/elasticsearch/xpack/transform/transforms/pivot/CompositeBucketsChangeCollector.java
@@ -565,7 +565,7 @@ public class CompositeBucketsChangeCollector implements ChangeCollector {
                             entry.getKey(),
                             entry.getValue().getMissingBucket(),
                             ((DateHistogramGroupSource) entry.getValue()).getRounding(),
-                            entry.getValue().getField().equals(synchronizationField)
+                            entry.getValue().getField() != null && entry.getValue().getField().equals(synchronizationField)
                         )
                     );
                     break;