Search Builder - broken for Custom data (Multiple Choice)

Steps.
1.Create custom group of individual.
2.Create custom Fields of multiple choices like radio or check-boxes or select values.
3.Go to contact add ,edit it, Add values for these custom values.
4.Go to search Builder
write query for searching contact using custom value.

"Individual" => "Martial Status" => "=" => "Single"
and result is..
*****************************************************
No matches found for:

• Contact Type - 'Individual' ... AND ...
• Marital Status =

Here in result status, it shows the empty field value in front of the Marital Status.