3256998 - org.xml.sax.SAXParseException with error - The element type "X" must be terminated by the matching end-tag "</X>"

It is observed, that messages are failing to reach a particular receiver completely.

After asked for an XPI 50 trace, it consists error like: [EXAMPLE!]

Catching Can't parse the document; nested exception caused by: 
Can't parse the document; nested exception caused by: 
org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 1201; The element type "X" must be terminated by the matching end-tag "</X>".
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:204)
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(ErrorHandlerWrapper.java:178)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:400)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:327)
at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(XMLScanner.java:1472)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(XMLDocumentFragmentScannerImpl.java:1751)
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Here the value "X" stands for a particular element from the used data.

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