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if (
    event.which == $.ui.keyCode.COMMA ||
    event.which == $.ui.keyCode.ENTER ||
    (
        event.which == $.ui.keyCode.TAB &&
        that._tagInput.val() !== ''
    ) ||
    (
        event.which == $.ui.keyCode.SPACE &&
        that.options.allowSpaces !== true &&
        (
            $.trim(that._tagInput.val()).replace( /^s*/, '' ).charAt(0) != '"' ||
            (
                $.trim(that._tagInput.val()).charAt(0) == '"' &&
                $.trim(that._tagInput.val()).charAt($.trim(that._tagInput.val()).length - 1) == '"' &&
                $.trim(that._tagInput.val()).length - 1 !== 0
            )
        )
    )
) {
    event.preventDefault();
    that.createTag(that._cleanedInput());

    // The autocomplete doesn't close automatically when TAB is pressed.
    // So let's ensure that it closes.
    that._tagInput.autocomplete('close');
}