Index: trunk/autoquest-htmlmonitor-test/src/test/java/de/ugoe/cs/autoquest/htmlmonitor/HtmlMonitorTest.java
===================================================================
--- trunk/autoquest-htmlmonitor-test/src/test/java/de/ugoe/cs/autoquest/htmlmonitor/HtmlMonitorTest.java	(revision 1911)
+++ trunk/autoquest-htmlmonitor-test/src/test/java/de/ugoe/cs/autoquest/htmlmonitor/HtmlMonitorTest.java	(revision 2232)
@@ -825,6 +825,9 @@
         if (file.exists()) {
             if (file.isDirectory()) {
-                for (File child : file.listFiles()) {
-                    deleteFiles(child);
+            	File[] files = file.listFiles();
+            	if (files != null) {
+                    for (File child : files) {
+                       deleteFiles(child);
+                    }
                 }
             }