diff --git a/jetty-util/src/main/java/org/eclipse/jetty/util/Scanner.java b/jetty-util/src/main/java/org/eclipse/jetty/util/Scanner.java
index 23d8c3b3807..6c0d1cbce53 100644
--- a/jetty-util/src/main/java/org/eclipse/jetty/util/Scanner.java
+++ b/jetty-util/src/main/java/org/eclipse/jetty/util/Scanner.java
@@ -578,8 +578,14 @@ public class Scanner extends AbstractLifeCycle
             if (f.isDirectory() && (depth<_scanDepth || _scanDepth==-1 || _scanDirs.contains(f)))
             {
                 File[] files = f.listFiles();
-                for (int i=0;i<files.length;i++)
-                    scanFile(files[i], scanInfoMap,depth+1);
+                if (files != null)
+                {
+                    for (int i=0;i<files.length;i++)
+                        scanFile(files[i], scanInfoMap,depth+1);
+                }
+                else
+                    LOG.warn("Error listing files in directory {}", f);
+                    
             }
         }
         catch (IOException e)