Index: src/java/org/apache/nutch/crawl/CrawlDbFilter.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- src/java/org/apache/nutch/crawl/CrawlDbFilter.java	(revision 1436737)
+++ src/java/org/apache/nutch/crawl/CrawlDbFilter.java	(revision )
@@ -84,7 +84,7 @@
     if (url404Purging && CrawlDatum.STATUS_DB_GONE == value.getStatus()) {
       url = null;
     }
-    if (urlNormalizers) {
+    if (url != null && urlNormalizers) {
       try {
         url = normalizers.normalize(url, scope); // normalize the url
       } catch (Exception e) {