Error: Invalid Token, in view=product task=apply

[EvanGR]

Hello, I am getting the following error when I try to edit a specific product (after hitting "Save")

Invalid Token, in view=product task=apply

When I open the product, even if I don't make any changes, and hit "Save", I get directed to the main Joomla control panel, with the message above showing up.

Any ideas?


[VM 3.8.8.10472 / J3.9.27]

[Jumbo!]

Does this product has many custom fields assigned to it?

[EvanGR]

Yes, but it's not the only one with many custom fields.