fix6974

teachcloud-mark/src/main/java/com/qmth/teachcloud/mark/service/impl/ScanPaperServiceImpl.java

@@ -151,7 +151,7 @@ public class ScanPaperServiceImpl extends ServiceImpl<ScanPaperMapper, ScanPaper
 //            throw new ParameterException("卡格式与考生科目不一致");
 //        }
         // cardNumber有变化，需要重新识别
-        if (!student.getCardNumber().equals(domain.getCardNumber())
+        if (student.getCardNumber()!=null&&!student.getCardNumber().equals(domain.getCardNumber())
                 && isEmptyPage(domain)) {
             throw new ParameterException("卡格式有变化需要重新识别, pages信息不能为空");
         }