Blank page without errors when loading a model.

I'm developing on opencart 2.3.0.2

I'm loading a model (I'm sure that the problem starts here since there's no output after doing it)
$this->load->model('extension/module/bnquotecart');
( the path is correct: model/extension/module/bnquotecart.php )
in the respective model file the class starts as:
class ModelExtensionModuleBnquotecart extends Model {
and should be fine.

When the specific page loads I get a blank page.
In other cases/models I have no problems.
I suppose (I really don't know) that opencart doesn't give specific errors when loading modules while for php there's no error at all (error_reporting is E_ALL).

How can I debug the problem to know if O.C. has loaded the model or any other way to find tip (error) to debug?



thank you!

Note: Error logs are empty. I'm updating my extension to o.c. 2.3.0.2

Well, this bnquotecart.php is something, not even Googie knows about, so, it's
sure no OC default Problem, one could know about...
Ernie