(IE9)Unable to get property 'dispatchEvent' of undefined or null reference - javascript

My code is:
var internal= $("span[title='expand']")[0];
var clickEvent = document.createEvent("MouseEvent");
clickEvent.initEvent("click",true,true);
internal.dispatchEvent(clickEvent);
and IE9 throws runtime error
Unable to get property 'dispatchEvent' of undefined or null reference
I am confused because IE9 starts supporting dispatchEvent. But IE10 AND IE11 works fine with the same code.
How can I solve it? Thanks!


Are you sure the local variable 'internal' is not undefined at the moment dispatchEvent is called?
Did the call to jQuery to fetch the span return a valid DOM Node?

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