diff -r f169cb347ed6 visualweb.insync/src/org/netbeans/modules/visualweb/insync/markup/MarkupUnit.java
--- a/visualweb.insync/src/org/netbeans/modules/visualweb/insync/markup/MarkupUnit.java	Tue Oct 14 18:04:37 2008 +0200
+++ b/visualweb.insync/src/org/netbeans/modules/visualweb/insync/markup/MarkupUnit.java	Tue Oct 14 11:10:43 2008 -0700
@@ -825,8 +825,8 @@ public class MarkupUnit extends SourceUn
 
             // TODO - gather ALL <base> elements within the head
             // and process them
-            Element root = sourceDocument.getDocumentElement();
-            Element html = findHtmlTag(root);
+            Element root = sourceDocument == null ? null : sourceDocument.getDocumentElement();
+            Element html = root == null ? null : findHtmlTag(root);
             if (html != null) {
                 Element head = Util.findChild("head", html, false);
                 if (head != null) {