From 7bb85e45c74dccff1d4b99bfbc5aa4619291320f Mon Sep 17 00:00:00 2001
From: Boaz Leskes <b.leskes@gmail.com>
Date: Sun, 14 Feb 2016 18:06:53 +0100
Subject: [PATCH] better proteciton against throwables with no message in
 assertions

---
 .../action/support/replication/TransportReplicationAction.java | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/core/src/main/java/org/elasticsearch/action/support/replication/TransportReplicationAction.java b/core/src/main/java/org/elasticsearch/action/support/replication/TransportReplicationAction.java
index fd3a6ec5757..01b0024995c 100644
--- a/core/src/main/java/org/elasticsearch/action/support/replication/TransportReplicationAction.java
+++ b/core/src/main/java/org/elasticsearch/action/support/replication/TransportReplicationAction.java
@@ -1041,7 +1041,8 @@ public abstract class TransportReplicationAction<Request extends ReplicationRequ
                                                 }
                                                 forceFinishAsFailed(new RetryOnPrimaryException(shardId, message, shardFailedError));
                                             } else {
-                                                assert shardFailedError.getMessage().contains("TransportService is closed") :
+                                                assert shardFailedError.getMessage() != null &&
+                                                        shardFailedError.getMessage().contains("TransportService is closed") :
                                                         shardFailedError;
                                                 onReplicaFailure(nodeId, exp);
                                             }