BUG修改

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

@@ -208,8 +208,8 @@ public class TEExamPaperController {
         ExamCourseCacheBean examCourseCacheBean = examCourseService.getExamCourseCacheBean(examPaperCacheBean.getExamId(), examPaperCacheBean.getCourseCode());
         Optional.ofNullable(examCourseCacheBean).orElseThrow(() -> new BusinessException("科目数据为空"));
 
-        Integer paperCount = examCourseCacheBean.getPaperCount();
-        paperCount = paperCount - 1;
+        Integer paperCount = Objects.nonNull(examCourseCacheBean.getPaperCount()) ? examCourseCacheBean.getPaperCount() : 0;
+        paperCount = paperCount.intValue() - 1;
         examCourseCacheBean.setPaperCount(Objects.isNull(paperCount) || paperCount.intValue() < 0 ? 0 : paperCount);
         TEExamCourse teExamCourse = GsonUtil.fromJson(GsonUtil.toJson(examCourseCacheBean), TEExamCourse.class);
         teExamCourse.setUpdateTime(System.currentTimeMillis());