Multiselect not working

[NVentimiglia]

Result is the Dropdown plugin fails with exception.

Here is my Html

<select class="select valid" id="Tags" multiple="multiple" name="Tags" aria-invalid="false"><option selected="selected" value="8.5 x 11">8.5 x 11</option>
<option value="AB Dick">AB Dick</option>
<option selected="selected" value="FDA Approved">FDA Approved</option>
<option selected="selected" value="Four Color">Four Color</option>
<option value="Novelty">Novelty</option>
<option value="Overstocked">Overstocked</option>
<option selected="selected" value="Sale">Sale</option>
<option value="Supplies">Supplies</option>
</select>

My jquery

 $(".select").dropdown();

The exception :

Uncaught Error: Syntax error, unrecognized expression: li[value=8.5 x 11],li[value=FDA Approved],li[value=Four Color],li[value=Sale]

These are all selected elements.

[NVentimiglia]

Debuging points to line 106

methods._select($dropdown, $dropdown.find(selectors.join(',')));