Just loaded a jQuery site into IE9 and threw the error "SCRIPT5007: Unable to get value of the property 'parentNode': object is null or undefined"

Code Before (working on Google Chrome but not in IE9)

$('#item-table tbody').click(function(){
	$(event.target.parentNode).toggleClass('row_selected');
})

Code After Fix

$('#item-table tbody').click(function(event){
	$(event.target.parentNode).toggleClass('row_selected');
})

All it required was making sure I put function(event) instead of function()