Index: trunk/autoquest-htmlmonitor/src/main/java/de/ugoe/cs/autoquest/htmlmonitor/HtmlMonitorOutputWriter.java
===================================================================
--- trunk/autoquest-htmlmonitor/src/main/java/de/ugoe/cs/autoquest/htmlmonitor/HtmlMonitorOutputWriter.java	(revision 1839)
+++ trunk/autoquest-htmlmonitor/src/main/java/de/ugoe/cs/autoquest/htmlmonitor/HtmlMonitorOutputWriter.java	(revision 2232)
@@ -535,5 +535,5 @@
      */
     private void handleOldLogFiles(File oldLogDir, File newLogDir) {
-        if (oldLogDir.exists() && oldLogDir.isDirectory()) {
+        if (oldLogDir.exists() && oldLogDir.isDirectory() && (oldLogDir.listFiles() != null)) {
             boolean allFilesRenamed = true;
             for (File oldLogFile : oldLogDir.listFiles()) {