离线考试null

examcloud-core-oe-admin-service/src/main/java/cn/com/qmth/examcloud/core/oe/admin/service/bean/examrecord/ExamRecordEntityConvert.java

@@ -116,7 +116,9 @@ public class ExamRecordEntityConvert {
 
         //每次考试持续时间
         if (recordData.getStartTime() != null && recordData.getEndTime() != null) {
-            info.setExamTime(recordData.getUsedExamTime() > 0 ? DateUtils.diff(recordData.getUsedExamTime()) : "");
+            if (recordData.getUsedExamTime() != null) {
+                info.setExamTime(recordData.getUsedExamTime() > 0 ? DateUtils.diff(recordData.getUsedExamTime()) : "");
+            }
         } else {
             info.setExamTime("");
         }