--- src/java/org/apache/poi/util/Units.java	(revisi¢n: 1655973)
+++ src/java/org/apache/poi/util/Units.java	(copia de trabajo)
@@ -26,11 +26,20 @@ 
     /**
      * Converts points to EMUs
      * @param points points
-     * @return emus
+     * @return EMUs
      */
     public static int toEMU(double points){
         return (int)Math.round(EMU_PER_POINT*points);
     }
+    
+    /**
+     * Converts pixels to EMUs
+     * @param pixels pixels
+     * @return EMUs
+     */
+    public static int pixelToEMU(int pixels) {
+        return pixels*EMU_PER_PIXEL;
+    }
 
     /**
      * Converts EMUs to points
--- src/ooxml/java/org/apache/poi/xwpf/usermodel/XWPFDocument.java	(revisi¢n: 1655973)
+++ src/ooxml/java/org/apache/poi/xwpf/usermodel/XWPFDocument.java	(copia de trabajo)
@@ -330,7 +330,7 @@ 
      */
     @Override
     public XWPFTable getTableArray(int pos) {
-        if (pos > 0 && pos < tables.size()){
+        if (pos >= 0 && pos < tables.size()){
             return tables.get(pos);
         }
         return null;
@@ -345,7 +345,10 @@ 
     }
 
     public XWPFFooter getFooterArray(int pos){
-        return footers.get(pos);
+        if(pos >=0 && pos < footers.size()) {
+            return footers.get(pos);
+        }
+        return null;
     }
 
     /**
@@ -357,7 +360,10 @@ 
     }
 
     public XWPFHeader getHeaderArray(int pos){
-        return headers.get(pos);
+        if(pos >=0 && pos < headers.size()) {
+            return headers.get(pos);
+        }
+        return null;
     }
 
     public String getTblStyle(XWPFTable table){
--- src/ooxml/java/org/apache/poi/xwpf/usermodel/XWPFFootnote.java	(revisi¢n: 1655973)
+++ src/ooxml/java/org/apache/poi/xwpf/usermodel/XWPFFootnote.java	(copia de trabajo)
@@ -111,7 +111,7 @@ 
      * @see org.apache.poi.xwpf.usermodel.IBody#getTableArray(int)
      */
     public XWPFTable getTableArray(int pos) {
-        if(pos > 0 && pos < tables.size()){
+        if(pos >= 0 && pos < tables.size()){
             return tables.get(pos);
         }
         return null;
@@ -177,8 +177,10 @@ 
      * @see org.apache.poi.xwpf.usermodel.IBody#getParagraphArray(int pos)
      */
     public XWPFParagraph getParagraphArray(int pos) {
-
-        return paragraphs.get(pos);
+        if(pos >=0 && pos < paragraphs.size()) {
+            return paragraphs.get(pos);
+        }
+        return null;
     }
 
     /**
@@ -206,7 +208,7 @@ 
             return null;
         }
         XWPFTableRow tableRow = table.getRow(row);
-        if(row == null){
+        if(tableRow == null){
             return null;
         }
         return tableRow.getTableCell(cell);
--- src/ooxml/java/org/apache/poi/xwpf/usermodel/XWPFHeaderFooter.java	(revisi¢n: 1655973)
+++ src/ooxml/java/org/apache/poi/xwpf/usermodel/XWPFHeaderFooter.java	(copia de trabajo)
@@ -203,8 +203,10 @@ 
      *  the text of the header or footer.
      */
     public XWPFParagraph getParagraphArray(int pos) {
-
-        return paragraphs.get(pos);
+        if(pos >= 0 && pos<paragraphs.size()){
+            return paragraphs.get(pos);
+        }
+        return null;
     }
 
     /**
@@ -425,7 +427,7 @@ 
      */
     public XWPFTable getTableArray(int pos) {
 
-        if(pos > 0 && pos < tables.size()){
+        if(pos >= 0 && pos < tables.size()){
             return tables.get(pos);
         }
         return null;
--- src/ooxml/java/org/apache/poi/xwpf/usermodel/XWPFTableCell.java	(revisi¢n: 1655973)
+++ src/ooxml/java/org/apache/poi/xwpf/usermodel/XWPFTableCell.java	(copia de trabajo)
@@ -340,7 +340,7 @@ 
      * @see org.apache.poi.xwpf.usermodel.IBody#getParagraphArray(int)
      */
     public XWPFParagraph getParagraphArray(int pos) {
-	if(pos > 0 && pos < paragraphs.size()){
+	if(pos >= 0 && pos < paragraphs.size()){
 	    return paragraphs.get(pos);
 	}
 	return null;
@@ -379,7 +379,7 @@ 
      * @see org.apache.poi.xwpf.usermodel.IBody#getTableArray(int)
      */
     public XWPFTable getTableArray(int pos) {
-	if(pos > 0 && pos < tables.size()){
+	if(pos >= 0 && pos < tables.size()){
 	    return tables.get(pos);
 	}
 	return null;