From d64a9d9029e20169cb215c1084cdb47bc5833643 Mon Sep 17 00:00:00 2001
From: Florian Schmaus <flo@geekplace.eu>
Date: Tue, 12 Jan 2021 09:41:46 +0100
Subject: [PATCH] [xdata] Fix NPE in DataForm.Builder.addItem()

Fixes SMACK-900.
---
 .../java/org/jivesoftware/smackx/xdata/packet/DataForm.java    | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/smack-extensions/src/main/java/org/jivesoftware/smackx/xdata/packet/DataForm.java b/smack-extensions/src/main/java/org/jivesoftware/smackx/xdata/packet/DataForm.java
index d56214d31..0457e69f3 100644
--- a/smack-extensions/src/main/java/org/jivesoftware/smackx/xdata/packet/DataForm.java
+++ b/smack-extensions/src/main/java/org/jivesoftware/smackx/xdata/packet/DataForm.java
@@ -494,6 +494,9 @@ public final class DataForm implements ExtensionElement {
          * @return a reference to this builder.
          */
         public Builder addItem(Item item) {
+            if (items == null) {
+                items = new ArrayList<>();
+            }
             items.add(item);
             return this;
         }