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I have a weird behavior and I don't know where it comes from. The shop is not something I implemented, I just want to help my friends resolve the issue.
The problem is that when I try to update product in admin panel, response looks more or less like this:
test{"product":{"tax_name":null,"tax_rate":null,"id_manufacturer":null,"id_supplier":"0","i....................
Post goes to this url: /index.php/product/form/136?_token=..........
So as you can see there is test at the beginning of the response and I don't know where to look foor it. I found echo 'test' in classes/Configuration.php but that seems to not resolve issue. So any idea where to start?