Syntax Error: Expected "}" when logging in - Articles/Products cannot be edited

I wonder if anyone can advise or help with this issue that has appeared over the weekend…

Immediately upon logging in into Shopware Backend, I receive this error:

Path: backend/Article/load

Error Type:  Syntax Error

Error: Expected ‘}’

SyntaxError: Expected ‘}’
   at Anonymous function (http://flikthru.co.uk/engine/Library/ExtJs/ext-all.js?201902250948:21:5356)
   at Anonymous function (http://flikthru.co.uk/engine/Library/ExtJs/ext-all.js?201902250948:21:5345)
   at success (http://flikthru.co.uk/backend/base?file=bootstrap&loggedIn=1554124688:3977:1)
   at callback (http://flikthru.co.uk/engine/Library/ExtJs/ext-all.js?201902250948:21:67494)
   at onComplete (http://flikthru.co.uk/engine/Library/ExtJs/ext-all.js?201902250948:21:422666)
   at onStateChange (http://flikthru.co.uk/engine/Library/ExtJs/ext-all.js?201902250948:21:422309)
   at Anonymous function (http://flikthru.co.uk/engine/Library/ExtJs/ext-all.js?201902250948:21:17397)

Unfortunately, it seems I cannot access or edit the existing products in the Overview screen. So quite a serious issue.

NB. Not sure it is related, but we activated HTTPS service this weekend.