Integer & NULLS
June 08, 08 byProblem
When you have a Field: current_zip = meta.IntegerField(maxlength=5,blank=True)
django will create a not nullable field in the DB. However leaving the field blank (in admin/web) django will try and insert a NULL value in the DB.
Solution
Add null=True:
current_zip = meta.IntegerField(maxlength=5,null=True,blank=True)