BUGFIX:试用用户;

src/main/java/com/ai/da/service/impl/AccountServiceImpl.java

@@ -480,7 +480,7 @@ public class AccountServiceImpl extends ServiceImpl<AccountMapper, Account> impl
                 throw new BusinessException("The username or email has already been registered", ResultEnum.PROMPT.getCode());
             }else {
                 Account account = accountList.get(0);
-                if (account.getValidEndTime() > System.currentTimeMillis()) {
+                if (null == account.getValidEndTime() || account.getValidEndTime() > System.currentTimeMillis()) {
                     throw new BusinessException("The username or email has already been registered", ResultEnum.PROMPT.getCode());
                 }
             }