Error 500: "This value should not be blank", when try to save combinations.

[Aircod]

Hello,
after upgrade my shop from the 1.7.7.2 to 1.7.8.6, I can't save product with combinations now. Console show error 500 with the following text: 

{
    "combination_16331_attribute_ecotax": [
        "This value should not be blank."
    ],
    "combination_16332_attribute_ecotax": [
        "This value should not be blank."
    ],
    "combination_16333_attribute_ecotax": [
        "This value should not be blank."
    ]
}

What is wrong?

Edited June 14, 2022 by Aircod (see edit history)

[Prestachamps]

Hi, 

Can you check the database table: ps_product and product_attribute - search for the ecotax filed where the value needs to be 0. I presume after teh upgrade in your case it become null or empty. 

Add manually to a certain product the value of "0.000000" and make a test after. It should solve your problem. 

I hope it helps, 

Cheers, 

LEo

[Hasnainraza Sundrani]

There is the value in both of this table ps_product and product_attribute in ecotax column but though I can't save the combination products.