diff -r db37acb952bc debugger.jpda/src/org/netbeans/modules/debugger/jpda/models/LocalsTreeModel.java
--- a/debugger.jpda/src/org/netbeans/modules/debugger/jpda/models/LocalsTreeModel.java	Thu Apr 10 19:07:48 2008 +0400
+++ b/debugger.jpda/src/org/netbeans/modules/debugger/jpda/models/LocalsTreeModel.java	Thu Apr 10 17:58:05 2008 +0200
@@ -206,6 +206,9 @@ public class LocalsTreeModel implements 
                     return new Object[] {};
                 }
                 List<Operation> operations = frame.getThread().getLastOperations();
+                if (operations == null) {
+                    return new Object[] {};
+                }
                 List<Variable> lastOperationValues = new ArrayList<Variable>(operations.size());
                 for (int i = 0; i < operations.size(); i++) {
                     Variable ret = operations.get(i).getReturnValue();