Incorrect structure: “}” or name of the object member is missing

[kaz]

Google sends me an e-mail with a reference to an error:

Incorrect structure: “}” or name of the object member is missing

I searched through my files manually, but can't find any unopened tags. Debug logs shows no error.
The page has a problem with a logo that is not displayed when the page is called up. As soon as I click on a link, it is displayed. The code of the embedded logo is correct, I am sure, because it is used frequently.

Is there a way to locate such an error localhost?

[TomPich]

Do you use structured data in your website? If you get no error but google tells you that, it’s the only cause I can think of now.
If so, you can check their validity here: https://developers.google.com/search/docs/appearance/structured-data

[kaz]

@TomPich Thanks, that was helpful, error found. I had a } error in schema.org in my prepand file. No idea why I didn't see that.