fixbug

themis-business/src/main/java/com/qmth/themis/business/service/impl/TEExamServiceImpl.java

@@ -197,7 +197,7 @@ public class TEExamServiceImpl extends ServiceImpl<TEExamMapper, TEExam> impleme
                 map.put(v.getExamId(), teExamActivityDtos);
                 ExamCacheBean examCache = getExamCacheBeanNative(v.getExamId());
                 ExamStudentCacheBean examStudentCacheBean = teExamStudentService.getExamStudentCacheBean(v.getExamStudentId());
-                v.setLeftExamCount(examCache.getExamCount() - examStudentCacheBean.getAlreadyExamCount());
+                v.setLeftExamCount(examCache.getExamCount() - (examStudentCacheBean.getAlreadyExamCount()==null?0:examStudentCacheBean.getAlreadyExamCount()));
                 if (Objects.nonNull(v.getInProcessLivenessFixedRangeStr())) {
                     String[] longs = v.getInProcessLivenessFixedRangeStr().trim().replaceAll(" ", "").split(",");
                     List inProcessLivenessFixedRange = new ArrayList();