java.lang.IllegalArgumentException: Key for session.getAttribute() is null

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java.lang.IllegalArgumentException: Key for session.getAttribute() is null
at weblogic.servlet.internal.session.SessionData.check(SessionData.java:457)
at weblogic.servlet.internal.session.SessionData.getAttribute(SessionData.java:410)
at org.owasp.csrfguard.CsrfGuard.updateToken(CsrfGuard.java:358)
at org.owasp.csrfguard.CsrfGuardHttpSessionListener.sessionCreated(CsrfGuardHttpSessionListener.java:13)

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