Adding New Products makes NULL Product_id

Hello All,
I have google searched this and can not find any answers.

Something has happened where, when I try to add a new product, after I click on Preview, then Insert...
The product doesn't appear in the list (category of where I added it).
So then I check using PHPMYADMIN to see what is going on and I
have 165 products listed, the 166th one has Products_Id is NULL (ie. It says NULL) instead of 166
All the product info is there, but the Products_Id is NULL... obviously it won't show anywhere on the site.

I have checked the other 2 tables that have to be the same and they have 0 (zero) in the Products_Id field.

When I try to add another product, it now comes up automatically with this Corrupt product details and if I add it again, it puts another load of details in the Fields with a NULL Products_Id again.
Please help.

Using the latest version

Sounds like you've lost the auto_increment setting in the database for the products_id field on your products table. That sort of thing generally only happens when doing an export/import of the database when changing servers and changing MySQL versions at the same time, or when someone is tampering with the database structure without sufficient understanding of the impact of messing around.

Hello,

Thankyou very much for this... Yes I actually just figured it out and came back here to post the answer. You are absolutely correct, the auto-increment got buggered up for some reason.
I made it a primary key and set it to auto-increment and all good now.
Thankyou.