### Eclipse Workspace Patch 1.0
#P org.eclipse.jdt.core
Index: model/org/eclipse/jdt/internal/core/ExternalFoldersManager.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core/model/org/eclipse/jdt/internal/core/ExternalFoldersManager.java,v
retrieving revision 1.20
diff -u -r1.20 ExternalFoldersManager.java
--- model/org/eclipse/jdt/internal/core/ExternalFoldersManager.java	30 Aug 2010 10:53:26 -0000	1.20
+++ model/org/eclipse/jdt/internal/core/ExternalFoldersManager.java	1 Sep 2010 06:38:57 -0000
@@ -405,7 +405,8 @@
 				for (int index = 0; index < this.externalFolders.size(); index++ ) {
 					if ((externalPath = (IPath)this.externalFolders.get(index)) != null) {
 						IFolder folder = getFolder(externalPath);
-						folder.refreshLocal(IResource.DEPTH_INFINITE, pm);
+						if (folder != null)
+							folder.refreshLocal(IResource.DEPTH_INFINITE, pm);
 					}
 					// Set the processed ones to null instead of removing the element altogether,
 					// so that they will not be considered as duplicates.