Googlebot visits results in exception ?

Hi,

Once in a while Googlebot comes by an ajax app made with gwt which results in an Exception.

I don't understand this and have no idea where to start :(

The page contains a login form and about 8 links. I don't use any anchor links (just div's with listener like the GWT Button for example).

Any idea's why this occurs? Or where to start searching?

Below the exception details (the client send the exception to the backend).

- Ed

Exception details:

-----The following error is received from the client----- 

Details:Browser info= [[Class$wub@a UserAgent=mozilla/5.0 (iphone; u; cpu iphone os 4_1 like mac os x; en-us) applewebkit/532.9 (khtml, like gecko) version/4.0.5 mobile/8b117 safari/6531.22.7] ]
ClientInfo:66.249.66.1:-1 Parameters: {} Headers: {content-type=text/x-gwt-rpc; charset=UTF-8, connection=Keep-alive, host=www.belastingvriendelijker.nl, X-GWT-Permutation=E359E4CFB6B5C50DFA06D9B281AC2352, accept=*/*, content-length=657, user-agent=Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html), X-GWT-Module-Base=https://www.bla.nl/login/, accept-encoding=gzip,deflate, referer=https://www.bla.nl/, Origin=https://www.bla.nl, From=googlebot(at)googlebot.com}
Extra:Class$JD: (TypeError): 'undefined' is not an object 

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