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Hello,

I'm investigating for a while not but I'm stuck and need some help.
I'm running prestashop 1.7.3 with PHP7.3 

Sometimes product updates in back office are not working while a success message is given. 

- When I look at the tools to inspect, I can see with a positive test that an answer is provided from the Ajax calls.
- When I do the same test with another product that I know upfront is causing trouble, I got an empty answer and it looks interpreted as a success then. Which is wrong. 

I already tried :

- Cache cleaning 
- Multiple browsers 
- Compare ajax query string, nothing particular
- Check server logs, nothing raised
- Compare both success and failing product in database tables. Didn't see any particular difference.
- Debug mode does not show anything.

So from that I would like to see how to investigate further. Would you have some indication?
From that empty answer, ideally I would like to see an error somewhere

Thanks a lot !