From e20c17050eea75864b32862cb301be2a8b9f2d3f Mon Sep 17 00:00:00 2001
From: Tibo-lg <leguilly.thibaut@gmail.com>
Date: Mon, 22 Jun 2015 11:25:08 +0200
Subject: [PATCH] Change `append` to `optAppend` for headers and data to avoid
 `NullPointerException`

---
 .../jivesoftware/smackx/hoxt/packet/AbstractHttpOverXmpp.java | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/smack-experimental/src/main/java/org/jivesoftware/smackx/hoxt/packet/AbstractHttpOverXmpp.java b/smack-experimental/src/main/java/org/jivesoftware/smackx/hoxt/packet/AbstractHttpOverXmpp.java
index 5ff11ab1d..4692e787b 100644
--- a/smack-experimental/src/main/java/org/jivesoftware/smackx/hoxt/packet/AbstractHttpOverXmpp.java
+++ b/smack-experimental/src/main/java/org/jivesoftware/smackx/hoxt/packet/AbstractHttpOverXmpp.java
@@ -42,8 +42,8 @@ public abstract class AbstractHttpOverXmpp extends IQ {
 
     protected IQChildElementXmlStringBuilder getIQChildElementBuilder(IQChildElementXmlStringBuilder xml) {
         IQChildElementXmlStringBuilder builder = getIQHoxtChildElementBuilder(xml);
-        builder.append(headers.toXML());
-        builder.append(data.toXML());
+        builder.optAppend(headers.toXML());
+        builder.optAppend(data.toXML());
 
         return builder;
     }