bug修复

teachcloud-report-business/src/main/java/com/qmth/teachcloud/report/business/service/impl/ReportCommonServiceImpl.java

@@ -526,8 +526,10 @@ public class ReportCommonServiceImpl implements ReportCommonService {
         HttpServletRequest request = ServletUtil.getRequest();
         HttpServletResponse response = ServletUtil.getResponse();
         HttpSession session = request.getSession();
-        session.invalidate();
-        log.info("logout is come in,session:{}", JacksonUtil.parseJson(session));
+        if (Objects.nonNull(session)) {
+            session.invalidate();
+            log.info("logout is come in,session:{}", JacksonUtil.parseJson(session));
+        }
         String casLogoutURL = "http://cas.whu.edu.cn/authserver/logout";
         // service后面带的参数为应用的访问地址，需要使用URLEncoder进行编码
         String redirectURL = casLogoutURL + "?service=" + URLEncoder.encode("http://cas.whu.edu.cn/authserver/login", SystemConstant.CHARSET_NAME);