Index: /trunk/autoquest-httpmonitor/src/main/java/de/ugoe/cs/autoquest/httpmonitor/HttpMonitorLogManager.java
===================================================================
--- /trunk/autoquest-httpmonitor/src/main/java/de/ugoe/cs/autoquest/httpmonitor/HttpMonitorLogManager.java	(revision 1417)
+++ /trunk/autoquest-httpmonitor/src/main/java/de/ugoe/cs/autoquest/httpmonitor/HttpMonitorLogManager.java	(revision 1418)
@@ -154,5 +154,7 @@
         public void run() {
             synchronized (HttpMonitorLogManager.this) {
-                if (System.currentTimeMillis() - writer.getLastUpdate() > SESSION_TIMEOUT) {
+                if ((writer != null) &&
+                    (System.currentTimeMillis() - writer.getLastUpdate() > SESSION_TIMEOUT))
+                {
                     writer.stop();
                     writer = null;