CspInterceptor assumes Session was already created

ERROR DefaultDispatcherErrorHandler Exception occurred during processing request: null 
java.lang.NullPointerException
at com.amazonaws.serverless.proxy.internal.servlet.AwsHttpServletRequest.getSession(AwsHttpServletRequest.java:139)
at javax.servlet.http.HttpServletRequestWrapper.getSession(HttpServletRequestWrapper.java:270)
at org.apache.struts2.dispatcher.SessionMap.put(SessionMap.java:171)
at org.apache.struts2.interceptor.csp.DefaultCspSettings.associateNonceWithSession(DefaultCspSettings.java:83)
at org.apache.struts2.interceptor.csp.DefaultCspSettings.addCspHeaders(DefaultCspSettings.java:71)
at org.apache.struts2.interceptor.csp.CspInterceptor.beforeResult(CspInterceptor.java:49)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:274)