yii postgresql文本数据类型不匹配

I'm trying to insert into text datatype column in postgresql with yii.

code in migration

'description' => 'text'

when trying to

$model->save()

where model is activerecord and

$model->description 

is some random string, I get the following

SQLSTATE[42804]: Datatype mismatch: 7 ERROR: argument of WHERE must be type boolean, not type text

LINE 1: SELECT 1 FROM "entry" "t" WHERE description LIMIT 1
^. The SQL statement executed was: SELECT 1 FROM "entry" "t" WHERE description LIMIT 1 

Everything works fine for mysql database or for varchar columns what's wrong here?

Edit: Apparently there are no problems with postgresql yii activerecord->save() somehow generates wrong queries for postgres