diff --git a/src/net/java/sip/communicator/impl/protocol/yahoo/ProtocolProviderServiceYahooImpl.java b/src/net/java/sip/communicator/impl/protocol/yahoo/ProtocolProviderServiceYahooImpl.java
index 234da045d..99bd20755 100644
--- a/src/net/java/sip/communicator/impl/protocol/yahoo/ProtocolProviderServiceYahooImpl.java
+++ b/src/net/java/sip/communicator/impl/protocol/yahoo/ProtocolProviderServiceYahooImpl.java
@@ -494,6 +494,16 @@ public void connectionClosed(SessionEvent ev)
         
         public void inputExceptionThrown(SessionExceptionEvent ev)
         {
+            if(ev.getException() instanceof YMSG9BadFormatException)
+            {
+                logger.error("Yahoo protocol exception occured exception",
+                    ev.getException());
+                logger.error("Yahoo protocol exception occured exception cause", 
+                    ((YMSG9BadFormatException)ev.getException().getCause()));
+            }
+            else
+                logger.error("Yahoo protocol exception occured", ev.getException());
+
             unregister(false);
             if(isRegistered())
                 fireRegistrationStateChanged(
@@ -511,4 +521,4 @@ public ProtocolIcon getProtocolIcon()
     {           
         return yahooIcon;
     }
-}
\ No newline at end of file
+}