From 7856fbdbe88f12d2522956f4812b9ab55d635302 Mon Sep 17 00:00:00 2001
From: orbiter <mc@yacy.net>
Date: Thu, 30 Oct 2014 15:20:35 +0100
Subject: [PATCH] fix for npe (in rare cases)

---
 .../cora/federate/solr/connector/AbstractSolrConnector.java   | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/source/net/yacy/cora/federate/solr/connector/AbstractSolrConnector.java b/source/net/yacy/cora/federate/solr/connector/AbstractSolrConnector.java
index 0bded3cae..eaaf8fcdd 100644
--- a/source/net/yacy/cora/federate/solr/connector/AbstractSolrConnector.java
+++ b/source/net/yacy/cora/federate/solr/connector/AbstractSolrConnector.java
@@ -174,7 +174,9 @@ public abstract class AbstractSolrConnector implements SolrConnector {
                         
                         try {
                             SolrDocument d = getDocumentById(nextID, fields);
-                            try {queue.put(d);} catch (final InterruptedException e) {}
+                            // document may be null if another process has deleted the document meanwhile
+                            // in case that the document is absent then, we silently ignore that case
+                            if (d != null) try {queue.put(d);} catch (final InterruptedException e) {}
                         } catch (final SolrException | IOException e) {
                             ConcurrentLog.logException(e);
                             // fail