bug fix

themis-admin/src/main/java/com/qmth/themis/admin/api/TBUserController.java

@@ -661,7 +661,7 @@ public class TBUserController {
             }
             tbUserService.saveOrUpdate(tbUser);
             //清除用户缓存
-            if (cacheClean) {
+            if (cacheClean && Objects.nonNull(authDto)) {
                 for (Source s : Source.values()) {
                     String sessionId = SessionUtil
                             .digest(tbUser.getId(), Math.abs(authDto.getRoleCodes().toString().hashCode()),