Blackberry 9800 Simulator crashing with ClassCastException when viewing a website

I have been developing a website but am finding it is crashing the simulator throwing a "ClassCastException".

Can anyone tell me what causes this?

I found the the following http://doc开发者_JAVA技巧s.blackberry.com/en/developers/deliverables/17970/Known_issues_1007761_11.jsp although I wouldn't have suspected this would be the cause?

Also found some other questions on SO but these relate to an IllegalStateException, and the solutions haven't helped. Blackberry 9800 Simulator Crashing When Launching Browser

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I went to try getting the logs and found the site had started working. What it was causing the exception I can't be sure could have possibly been console.log commands left in.