java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.xpn.xwiki.plugin.ldap.XWikiLDAPUtils.isMemberOfGroup(XWikiLDAPUtils.java:443)
at com.xpn.xwiki.plugin.ldap.XWikiLDAPUtils.isMemberOfGroups(XWikiLDAPUtils.java:465)
at com.xpn.xwiki.user.impl.LDAP.XWikiLDAPAuthServiceImpl.syncGroupsMembership(XWikiLDAPAuthServiceImpl.java:614)
at com.xpn.xwiki.user.impl.LDAP.XWikiLDAPAuthServiceImpl.syncGroupsMembership(XWikiLDAPAuthServiceImpl.java:572)
at com.xpn.xwiki.user.impl.LDAP.XWikiLDAPAuthServiceImpl.ldapAuthenticateInContext(XWikiLDAPAuthServiceImpl.java:456)
at com.xpn.xwiki.user.impl.LDAP.XWikiLDAPAuthServiceImpl.ldapAuthenticate(XWikiLDAPAuthServiceImpl.java:202)
at com.xpn.xwiki.user.impl.LDAP.XWikiLDAPAuthServiceImpl.authenticate(XWikiLDAPAuthServiceImpl.java:149)

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