Index: AsyncAppender.java
===================================================================
--- AsyncAppender.java	(revision 644293)
+++ AsyncAppender.java	(working copy)
@@ -159,6 +159,7 @@
       event.getLocationInformation();
     }
     event.getRenderedMessage();
+    event.getThrowableStrRep();
 
     synchronized (buffer) {
       while (true) {