avatar field is missing the default option

I figured out that the cause of the problem ist not 3rd party plugins but the CB query field plugin. As soon as I disable my custom field that is based on the CB query field plugin the avatar field works as expected.

This is the query I use:
SELECT #__comprofiler.id as schoolid,CONCAT_WS('',(SELECT #__country_info.iso FROM #__country_info,#__comprofiler WHERE schoolid=#__comprofiler.id AND #__country_info.id=#__comprofiler.cb_country),' ',cb_zipcode,' ',cb_city,' | ', cb_school) AS schoolname FROM #__comprofiler WHERE cb_usertype=18 ORDER BY schoolname ASC

(#__country_info is my own custom table)

How can this query screw up the form? What can I do to have both a working avatar field and my custom query?

Thanks

Enable debug mode and maximum error reporting in Joomla global configuration. You should see a fatal error if your query is invalid, which is the only way I can think of it causing your issue. I can't see any reason for CB Query Field to break your image field other than that. It's difficult to see what's going on in your query, but it doesn't appear valid.