[3.2.1]Uncaught SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data

Software Support
1

After updating from version 3.2.0 to 3.2.1 I cannot view the XML files. Previously updated from 2.4 to 3.2.0.
It shows me the following error:

Uncaught SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data on line 5.

      $ .isXMLDoc (t)
                ? (e = r.convertDocument (t))
                : ("string" == typeof t && (t = $ .parseJSON(t)), <-- here marks the problem
                (e = r.Article.fromSnapshot (t))),
                "toc" === o.panel &&
                e.getHeadings (). length <= 2 &&
                (o.panel = "info"),
                r.createReader (e, o);
2

Can you provide reproduction steps? This should be the whole set of steps you take before encountering the error.