I had created a table with a column as NOT NULL. I modified Not Null column to Null in table later as the requirement changed. I am unable to get rid of a check on this previously Not Null column. I have checked and rechecked the form code. It is being triggered from somewhere inside Phalcon. Not sure why it is happening. I am using Phalcon 1.3.1, MySQL 5.6.17 on Wamp platform. If I do not fill any value in this column I always get a message "myfieldname is required". If I set "notNullValidations" to false in controller then the error goes away.