[Rails] How to write an ActiveRecord conditions containing null?

Code snippet:

conditions = {:org => ["ABC", "XYZ"]}
Defect.count :conditions => conditions

work as expected.

This doesn't:

conditions = {:org => ["ABC", "XYZ", nil]}
Defect.count :conditions => conditions

Get error: ActiveRecord::ActiveRecordError: Syntax error: Encountered
"NULL" at line 1, column 87.: SELECT count(*) AS count_all FROM defects
WHERE (defects.org IN ('ABC','XYZ',NULL))

Any idea?
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