Rest API : #1062 - duplicate entry for key 'primary' - rest

Question

I want upload some image to server with rest API using Codeigniter.
But I have a problem after upload image / refresh phpmyadmin on this table.
I know this problem is classic, what I'm already todo:
Re-Create the table 2 times.
Make ID to Autoincrement (actually I'm make it AI at first make table)
Not include ID on insert operation, and make it AI automatic.
I'm already truncate the table 2 times
but nothing change anything, at I'm refresh page phpmyadmin this error always appear.
What's my mistake ?
Thanks
If you think my error because my code Rest-API, here's my code:
Controller:
public function upload_post()
{
// $config['max_size'] = '100';
// $config['max_width'] = '1024';
// $config['max_height'] = '768';
$msgCreated = ['status' => true, 'message' => 'Image Has Been Upload'];
$msgFailCreated = ['status' => false, 'message' => 'Failed to Upload Image !'];
$config['upload_path'] = './image/';
$config['allowed_types'] = 'gif|jpg|png';
$this->load->library('upload', $config);
$this->upload->initialize($config);
if (!$this->upload->do_upload('file')) {
$this->set_response($msgFailCreated, 404);
} else {
$info = $this->upload->data();
$image_path = base_url("image/" . $info['raw_name'] . $info['file_ext']);
$data = [
"name_image" => $this->input->post('name_image'),
"image" => $image_path
];
if ($this->mahasiswa->insertImage($data)) {
$this->set_response($msgCreated, 201);
} else {
$this->set_response($msgFailCreated, 400);
}
}
}
Model:
//? Membuat Upload Image
public function insertImage($data){
return $this->db->insert('image', $data);
}