Protection against NPE

src/main/java/org/docx4j/model/listnumbering/ListNumberingDefinition.java

@@ -207,7 +207,9 @@ public ListNumberingDefinition(Numbering.Num numNode,
 							// is encountered in the document
 							StartOverride startOverride = overrideNode.getStartOverride();
 							if (startOverride != null
-									&& startOverride.getVal() != null) {
+									&& startOverride.getVal() != null
+									&& this.levels.size() > 0
+									&& this.levels.get(overrideLevelId) != null) {
 
 								this.levels.get(overrideLevelId).setStartValue(
 										startOverride.getVal().subtract(BigInteger.ONE));

src/test/java/org/docx4j/model/listnumbering/ListNumberingDefinitionTest.java

@@ -0,0 +1,40 @@
+/*
+ *  Copyright 2016, Plutext Pty Ltd.
+ *   
+ *  This file is part of docx4j.
+    docx4j is licensed under the Apache License, Version 2.0 (the "License"); 
+    you may not use this file except in compliance with the License. 
+    You may obtain a copy of the License at 
+        http://www.apache.org/licenses/LICENSE-2.0 
+    Unless required by applicable law or agreed to in writing, software 
+    distributed under the License is distributed on an "AS IS" BASIS, 
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
+    See the License for the specific language governing permissions and 
+    limitations under the License.
+ */
+package org.docx4j.model.listnumbering;
+
+import org.docx4j.openpackaging.exceptions.Docx4JException;
+import org.docx4j.openpackaging.packages.WordprocessingMLPackage;
+import org.junit.Test;
+
+/**
+ * @author AbuZekry
+ *
+ */
+public class ListNumberingDefinitionTest extends AbstractNumberingTest {
+
+	@Test
+	public void test() throws Docx4JException {
+
+		// Load the docx
+		String inputfilepath = System.getProperty("user.dir") 
+				+ "/src/test/java/org/docx4j/model/listnumbering/HWRD-1055-01.docx";	    				
+
+		WordprocessingMLPackage wordMLPackage = WordprocessingMLPackage.load(new java.io.File(inputfilepath));
+
+
+		testNumbering(wordMLPackage);
+	}
+
+}