JS console error when plugin is active

Hello,

After updating plugins and WordPress I get the following error in JS console:

Uncaught SyntaxError: Unexpected token o in JSON at position 1
at JSON.parse (<anonymous>)
at Object.set (cookie-law-info-public.js?ver=1.9.3:3)
at HTMLDocument.<anonymous> (cookie-law-info-public.js?ver=1.9.3:4)
at i (jquery.js?ver=1.12.4-wp:1)
at Object.fireWith [as resolveWith] (jquery.js?ver=1.12.4-wp:1)
at Function.ready (jquery.js?ver=1.12.4-wp:1)
at HTMLDocument.J (jquery.js?ver=1.12.4-wp:1)

If I deactive plugin the error does not exist anymore in JS cosole. We had to start using som other cookie plugin.