diff -r df7ce4731eaf css.editor/src/org/netbeans/modules/css/editor/CssHelpResolver.java
--- a/css.editor/src/org/netbeans/modules/css/editor/CssHelpResolver.java	Thu Oct 16 17:10:03 2008 +0200
+++ b/css.editor/src/org/netbeans/modules/css/editor/CssHelpResolver.java	Thu Oct 16 17:50:03 2008 +0200
@@ -165,7 +165,7 @@
 
     public URL getPropertyHelpURL(String propertyName) {
         PropertyDescriptor pd = getPD(propertyName);
-        if (pd == null) {
+        if (pd == null || HELP_URL==null) {
             return null;
         } else {
             try {
diff -r df7ce4731eaf css.editor/src/org/netbeans/modules/css/gsf/CSSCompletion.java
--- a/css.editor/src/org/netbeans/modules/css/gsf/CSSCompletion.java	Thu Oct 16 17:10:03 2008 +0200
+++ b/css.editor/src/org/netbeans/modules/css/gsf/CSSCompletion.java	Thu Oct 16 17:50:03 2008 +0200
@@ -459,7 +459,11 @@
     }
    
     public ElementHandle resolveLink(String link, ElementHandle elementHandle) {
-        return new ElementHandle.UrlHandle(CssHelpResolver.HELP_URL + link);
+        if(CssHelpResolver.HELP_URL==null){
+            return null;
+        }else{
+            return new ElementHandle.UrlHandle(CssHelpResolver.HELP_URL + link);
+        }
     }
     
     public String getPrefix(CompilationInfo info, int caretOffset, boolean upToOffset) {