Merge branch 'active_course_2021-09-26～29' of http://git.dayaedu.com/yonge/mec

mec-biz/src/main/java/com/ym/mec/biz/service/impl/PracticeGroupServiceImpl.java

@@ -5036,7 +5036,7 @@ public class PracticeGroupServiceImpl extends BaseServiceImpl<Long, PracticeGrou
         if(practiceGroup.getPaymentExpireDate().before(date)){
             throw new BizException("该课程已结束报名!");
         }
-        if(practiceGroup.getStudentId().equals(user.getId())){
+        if(!practiceGroup.getStudentId().equals(user.getId())){
             throw new BizException("您无法购买此课程");
         }