SQLSTATE[42000]: Syntax error or access violation

Hi All,

When trying to sort a view using Style: Table with the settings as shown in settings.png (attached) i get the following notice and error:

Notice: Undefined index: field_company_building_city_value in views_handler_field_field->click_sort() (regel 130 van C:\xampplite\htdocs\gvanpijkeren.nl\sites\all\modules\views\modules\field\views_handler_field_field.inc).
Statusbericht
Debug:

'Exception: SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near \'ASC
LIMIT 10 OFFSET 0\' at line 2'

in views_plugin_query_default->execute() (regel 1314 van C:\xampplite\htdocs\gvanpijkeren.nl\sites\all\modules\views\plugins\views_plugin_query_default.inc).

This only happens when i am trying to sort by custom field. Sorting by the Title field works like a charm.

I attached the error in the error.png file.