TypeError: Cannot read properties of undefined (reading 'tagName') when parsing closing tag without an opening tag at the start of XML document

[lulunac27a]

• [x] Have you included sample input, output, error, and expected output?
• [x] Are you running the latest version?
• [x] Have you checked if you are using correct configuration?
• [x] Did you try online tool?

Description

I got an error saying TypeError: Cannot read properties of undefined (reading 'tagName') when I put closing tag at the start of XML document

Input

</a>

Code

new XMLParser().parse('</a>');
XMLValidator().validate('</a>');

Output

TypeError: Cannot read properties of undefined (reading 'tagName')

expected data

Error: closing tag found at start of XML document Would you like to work on this issue?

• [x] Yes
• [ ] No

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[airone01]

I can confirm the bug and reproduce.

[MaelAbgrall]

I came here after a bug in prod that had the trace stating the same thing.

However, using lulunac27a example, I can only reproduce it in the online editor, can't on my dev machine with package version 4.3.5 and 4.3.4.

The trace I got from logs in prod is:

TypeError: Cannot read properties of undefined (reading 'tagName')
    at OrderedObjParser.parseXml (/backend/node_modules/fast-xml-parser/src/xmlparser/OrderedObjParser.js:281:29)
    at XMLParser.parse (/backend/node_modules/fast-xml-parser/src/xmlparser/XMLParser.js:35:48)