[PS 1.7.2.1] Problem after update - E_INVALID_PAR_TYPE (json) - product edit

[mateusz.pietras]

Hello!
 
Recently I updated the store to version 1.7.2.1. After saving the product disappear all the features added to it (I use the multiple features module and of course the developer has directed the first steps). Together we found that this is not a module issue, and just in the shop when editing the product I see a JS error.
 
Error Name:
 
Uncaught Error: E_INVALID_PAR_TYPE: {"expected": "Plain Object", "name": "json", "value": "{...
 
Has anyone met this problem? Previously the store was in version 1.7.1.2 and no problem was there, appeared after the update. I will be grateful for any tips.

[creation-handicap]

I got the exact same problem. Is there any solution for this?

Edited February 10, 2021 by creation-handicap (see edit history)