Index: xword/XWikiLib/Logging/Log.cs
===================================================================
--- xword/XWikiLib/Logging/Log.cs	(revision 19784)
+++ xword/XWikiLib/Logging/Log.cs	(working copy)
@@ -23,13 +23,17 @@
         /// <param name="type">The type of the message.</param>
         public static void Write(String message, EventLogEntryType type)
         {
+            //The message for EventLog can not exceed 32766 bytes
+            int MAX_MSG_SIZE = 32766;
+            String msg = (message.Length > MAX_MSG_SIZE) ? message.Substring(0, MAX_MSG_SIZE) : message;
+
             if (EventLog.Exists(logName))
             {
                 EventLog.CreateEventSource(eventSource, logName);
             }
             else
             {
-                EventLog.WriteEntry(eventSource, message, type);
+                EventLog.WriteEntry(eventSource, msg, type);
             }
         }