"targets" not define error on IE8

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....
"columnDefs": [
{
"targets": [ 0 ],
"visible": false
},
{
"targets": [ 1 ],
"className": "user_view"
}, <------- error comma.
],
.
.
.
[Question]
When you add a comma, you can see error.
Did you ever know why?

(jquery.dataTables.js version is 1.10.5)