     $this.typeahead(
       source: (query, process) ->
         variable_id = $this.data('variable-id')
-        return $.get(root_url + 'projects/' + $("#sheet_project_id").val() + '/variables/' + variable_id + '/typeahead', { query: query, sheet_authentication_token: $('#sheet_authentication_token').val() }, (data) -> return process(data))
+        return $.get(root_url + 'projects/' + $("#sheet_project_id").val() + '/variables/' + variable_id + '/typeahead', { query: query, sheet_authentication_token: ($('#sheet_authentication_token').val() || "") }, (data) -> return process(data))
     )
   )
 

    )
    .on('click', '[data-object~="grid-row-add"]', () ->
      variable_id = $(this).data('variable-id')
      $.post(root_url + 'projects/' + $("#sheet_project_id").val() + '/variables/' + variable_id + '/add_grid_row', 'sheet_authentication_token=' + $('#sheet_authentication_token').val(), null, "script")
      false
    )
    .on('click', '[data-object~="set-current-time"]', () ->

        grid_string = '[data-grid-position="' + grid_position + '"]'
      calculation = calculation.replace(/([a-zA-Z]+[\w]*)/g, "parseFloat($('[data-name=\"\$1\"]#{grid_string}').val())");
      calculation_result = eval(calculation)
      $.get(root_url + 'projects/' + $("#sheet_project_id").val() + '/variables/' + $(this).data('variable-id') + '/format_number', 'calculated_number=' + calculation_result + '&location_id=' + $(this).data('location-id') + '&sheet_authentication_token=' + ($('#sheet_authentication_token').val() || ""), null, "script")

    # $(this).val(calculation_result)
    # $($(this).data('target')).html(calculation_result)
