White blank page & no error given

[eluser]cngzdyrn[/eluser]
Hi brothers,

I have a trouble, please help me.

My application works on my localhost. But after upload production server some controllers give blank page error. Php dent give error without i open php errors. After that i choose a controller which has a problem. And i looked controller code and i found code which it cause problem. The code below. After i remove it is working.

Code:

if(!empty($this->input->post('district_id'))){
$insert_data['district_id'] = $this->input->post('district_id');
}
if(!empty($this->input->post('town_id'))){
$insert_data['town_id'] = $this->input->post('town_id');
}

What is problem? Do u have any idea?