Getting exception when trying to parse the subject node in saml response

In SamlSubjectParser getting exception when trying to parse the nameid tag. We are decrypting the assertion first and then parsing.

Unencrypted subject is :
<ns2:Subject>^M
<ns2:NameID Format="urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified">iesspdev</ns2:NameID>^M
<ns2:SubjectConfirmation Method="urn:oasis:names:tc:SAML:2.0:cm:bearer">^M
<ns2:SubjectConfirmationData NotOnOrAfter="2020-06-01T14:34:31Z" Recipient="https://XXXXXXXXXX"/>^M
</ns2:SubjectConfirmation>^M
</ns2:Subject>^M

Exception we are getting is :
< ClassCastException occured because org.codehaus.stax2.ri.evt.CharactersEventImpl cannot be cast to javax.xml.stream.events.EndElement. But Continuing with Flow of Execution.. >
java.lang.ClassCastException: org.codehaus.stax2.ri.evt.CharactersEventImpl cannot be cast to javax.xml.stream.events.EndElement
at org.picketlink.identity.federation.core.parsers.saml.SAMLSubjectParser.parse(SAMLSubjectParser.java:128)
at org.picketlink.identity.federation.core.parsers.saml.SAMLAssertionParser.parse(SAMLAssertionParser.java:132)
at org.picketlink.identity.federation.core.parsers.saml.SAMLAssertionParser.fromElement(SAMLAssertionParser.java:67)