Hi there,
I wanted to use code generated by Gii for displaying all results of a particular model (slightly modified by me, but still working without any problems):
$criteria = new CDbCriteria;
$criteria->select='ID, LOGN, MAIL';
$dataProvider = new CActiveDataProvider($model, array
(
    	'pagination'=>array('pageSize'=>20),
    	'sort'=>array('defaultOrder'=>'ID'),
    	'criteria'=>$criteria,
));
$this->widget('zii.widgets.grid.CGridView', array
(
    	'id'=>'users-grid',
    	'dataProvider'=>$dataProvider,
    	'filter'=>$model,
    	'columns'=>array
    	(
            	'ID',
            	'LOGN',
            	'MAIL',
            	array
            	(
                    	'class'=>'CButtonColumn',
            	),
),));
and to change it from using CActiveDataProvider to CSqlDataProvider. Therefore I pasted example code found in CSqlDataProvider in class reference with a little bit modifications from my side:
$count = Yii::app()->db->createCommand('SELECT COUNT(*) FROM WWW_USERS')->queryScalar();
$sql = 'SELECT * FROM WWW_USERS';
$dataProvider = new CSqlDataProvider($sql, array
(
 	'id'=>'user',
 	'keyField'=>'ID',
 	'totalItemCount'=>$count,
 	'sort'=>array
 	(
            	'attributes'=>array
            	(
                    	'ID', 'LOGN', 'MAIL',
            	),
            	'defaultOrder'=>'ID'
 	),
 	'pagination'=>array
 	(
            	'pageSize'=>20,
 	),
));
But I have to turn-off (comment-out) CButtonColumn column because with it enabled (first block of code) I’m getting error: “Trying to get property of non-object” with “CComponent.php(616) : eval()'d code:1”.
Since in both cases I used not my own code (first generated by Gii, second taken from guide), if I didn’t broke something during these slight customizations, then it seems to be an internal, core-code related problem. And I started this thread to ask, if someone has similar problems or maybe if someone sees an error in the code, I can’t find. Thank you.